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11-10-2008, 02:14 PM
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#1
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Registered User
Join Date: Jan 2008
Posts: 66
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cleaning boat bottom/heavily stained
hi folks anyone got any suggestions as to what i can clean the bottom of my boat,the stain is very heavy almost black in places i have already tried TFR,and household bleaches but no joy,The boat has only ever been kept in fresh water and is original gelcoat.
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11-10-2008, 02:22 PM
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#2
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Registered User
Country: UK
Location: Thorpe Bay
Occupation: IT Director, www.lighthouseit.co.uk
Interests: Boats, Surfing & Snowboarding
Boat name: Isabella / Cool Runnings II / Bella / Sea Pup / Sea Dog / Speedy II / Bernico F3
Boat make: Colvic 35 Suncruiser / Bernico F3 / Phantom 16 / Zodiac 420 YL / RIB / Apollo 9
Engines: 2 x Perkins Sabre 225ti / Mercury Pro XS /Mercury Pro XS 115/ Tohatsu 2.5 / Mercury 25 / Mercury 50
Cruising area: Thames Estuary / River Crouch / Salcombe
Join Date: Jun 2004
Location: Thorpe Bay
Posts: 932
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brick cleaner or brick acid from B&Q just paint on with a brush wear gloves protect galvernised trailer i wear eye protection as well. leave on for a couple of mins and hose off with plenty of water. Job done in 10mins max. Once dry rewax hull.
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Loving the Spitfire with a 25HP Mercury
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13-10-2008, 01:15 AM
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#3
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Registered User
Country: Ireland
Location: Dublin
Occupation: Boatbuilder
Boat make: Hydrostream V-king, 650SS OCR ,Ring 21, Ring 18, Phantom 18.
Engines: 300Hp Mercury 2.4, 130 Yamaha, Bridgeport EFI, XR6, Merc 200.
Cruising area: Malahide, Dublin
Join Date: May 2004
Location: Dublin
Posts: 1,803
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Alloy wheel cleaner, spray it on and wash off with water
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13-10-2008, 11:18 AM
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#4
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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I don't like all those aggressive cleaners, with acid etc.
Just about any stain will come off easily with some elbow grease and T-cut. it also removes a minute layer of outer gel, and leaves a smooth finish that will resist future staining, especially if you wax it after polishing, whereas the aggressive stuff will leave a perfect keyed finish for the staining to return, ie, it's a short term fix.
JMHO.
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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13-10-2008, 07:33 PM
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#5
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Registered User
Country: Ireland
Location: Dublin
Occupation: Boatbuilder
Boat make: Hydrostream V-king, 650SS OCR ,Ring 21, Ring 18, Phantom 18.
Engines: 300Hp Mercury 2.4, 130 Yamaha, Bridgeport EFI, XR6, Merc 200.
Cruising area: Malahide, Dublin
Join Date: May 2004
Location: Dublin
Posts: 1,803
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Quote:
Originally Posted by Jon Fuller
I don't like all those aggressive cleaners, with acid etc.
Just about any stain will come off easily with some elbow grease and T-cut. it also removes a minute layer of outer gel, and leaves a smooth finish that will resist future staining, especially if you wax it after polishing, whereas the aggressive stuff will leave a perfect keyed finish for the staining to return, ie, it's a short term fix.
JMHO.
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Agreed, but for a one time deal it should be ok!
I have often wondered about the use of chems on gelcoat, most if not all gelcoat now is isophthalic and should resist a mild exposure to chemicals for a short period of time.
Whereas polishing and repolishing gel opens up porosity, a great place for dirt to lodge.
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13-10-2008, 07:39 PM
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#6
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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I certainly agree that you can't beat a nice, original virgin mould finish. That seems to be the most resiliant to all stains etc, and has a real nice lustre (assuming the mould finish is good) but this guy sounds to be way past the original lustre stage.
don't like acid.
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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13-10-2008, 07:41 PM
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#7
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Registered User
Country: England
Location: Hampshire
Occupation: Credit Crunched
Interests: Rally Driving
Boat name: Double 2 Shirts
Boat make: Planatec 41
Engines: 2x625's+ From Uncle Sam
Cruising area: Solent
Join Date: May 2007
Location: Hampshire
Posts: 2,522
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Quote:
Originally Posted by Jon Fuller
I certainly agree that you can't beat a nice, original virgin mould finish. That seems to be the most resiliant to all stains etc, and has a real nice lustre (assuming the mould finish is good) but this guy sounds to be way past the original lustre stage.
don't like acid.
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Cilit Bang ? Works on engine bays might be worth a try
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13-10-2008, 10:33 PM
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#8
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Registered User
Country: uk
Location: devon
Occupation: costruction
Interests: power boats
Boat name: smokin aces
Boat make: x cat
Engines: mercs
Cruising area: lyme bay
Join Date: Mar 2004
Location: devon
Posts: 389
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starbrite hull cleaner is very good , acid is not ,what happens is when the boat returns to the water it will go a browny tint very quickly , then the only thing to shift that is more acid which cant be right.
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13-10-2008, 11:08 PM
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#9
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Registered User
Country: Ireland
Location: Dublin
Occupation: Boatbuilder
Boat make: Hydrostream V-king, 650SS OCR ,Ring 21, Ring 18, Phantom 18.
Engines: 300Hp Mercury 2.4, 130 Yamaha, Bridgeport EFI, XR6, Merc 200.
Cruising area: Malahide, Dublin
Join Date: May 2004
Location: Dublin
Posts: 1,803
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Starbrite hull cleaner is acid based, it is actually alloy wheel cleaner, that's why I sugested it as it's half the price, same stuff!
Cilit bang works well too, but again, acid based...
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13-10-2008, 11:12 PM
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#10
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Registered User
Join Date: Jan 2008
Posts: 66
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thanks guys,over the weekend i tried an acid type cleaner on a small area and it was brilliant ,came off with ease,but after what john mentioned about the chemicals im not sure about doing the entire boat with it,what if i were to machine compound and wax afterwards,any thoughts.
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13-10-2008, 11:18 PM
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#11
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Registered User
Country: uk
Location: devon
Occupation: costruction
Interests: power boats
Boat name: smokin aces
Boat make: x cat
Engines: mercs
Cruising area: lyme bay
Join Date: Mar 2004
Location: devon
Posts: 389
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what about viakal tap cleaner is that acid
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13-10-2008, 11:29 PM
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#12
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Registered User
Join Date: Jan 2008
Posts: 66
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No idea ,i have never heard of it,but im definately having second thoughts about using the acid,whilst it removes the heavy stains easily,i dont want to leave myself in the situation where it gets stained quickly when launched again,then more acid
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14-10-2008, 12:26 AM
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#13
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Junior Member
Join Date: Mar 2008
Posts: 29
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try y10 brush on wash off
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14-10-2008, 01:09 AM
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#14
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Registered User
Country: Ireland
Location: Dublin
Occupation: Boatbuilder
Boat make: Hydrostream V-king, 650SS OCR ,Ring 21, Ring 18, Phantom 18.
Engines: 300Hp Mercury 2.4, 130 Yamaha, Bridgeport EFI, XR6, Merc 200.
Cruising area: Malahide, Dublin
Join Date: May 2004
Location: Dublin
Posts: 1,803
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Quote:
Originally Posted by chris
what about viakal tap cleaner is that acid
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it's probably limescale remover, which is probably a mild acid solution, Y10 is an acid for sure!
My curiosity has always been that, compounding removes a layer and exposes porosity in the gel, chemicals dont remove this layer but certain chemicals can break down the molecular structure of the gelcoat! Most gel is now Isophthalic which has a higher resistance to chemical exposure.
Some fuel tanks are made from fiberglass and have a constant exposure to chemicals.
Quote:
Isophthalic: Reacted into the resin, isophthalic acid provides greater levels of water (acid) and chemical resistance than does orthophthalic anhydride. This is especially important in the manufacture of boats, shower and bath enclosures. Greater chemical, weather and corrosion resistance with a higher degree of flexibility are the immediate benefits when isophthalic acid replaces orthophthalic acid in the resin.
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I've seen some water stains in gel so deep that even compounding wont remove without a 600 heavy cut!
So it's just a matter of which is the lesser of the two evils.
Dont leave your boat in the water very long
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14-10-2008, 01:21 AM
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#15
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Junior Member
Join Date: Mar 2008
Posts: 29
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i bought a bottle of wax for under the hull a couple of years ago it was supposed to help performance and keep the hull fron staining it was called safe speed skin i took the boat of the trailer and applied five coats as instructed
i put the boat back in the water and after three days i noticed it stained and after the season the boat was as black as the ace of spades
the polish stayed on ok but instead it stained and was a night mare to get off
and it cost me 80 quid
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14-10-2008, 08:09 AM
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#16
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numbskull
Country: United Kingdom
Location: South
Occupation: none
Interests: none
Boat name: Leviathan
Boat make: Phantom 28
Cruising area: South Coast
Join Date: Mar 2004
Location: South
Posts: 15,959
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Quote:
Originally Posted by Hydrostream
Dont leave your boat in the water very long
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The best advice so far, by far.
Dry berthing rules.
__________________
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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14-10-2008, 08:32 AM
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#17
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Registered User
Country: England
Location: Hampshire
Interests: Lots of things
Cruising area: Basingstoke ring road.
Join Date: May 2007
Location: Hampshire
Posts: 331
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Stick a picture of the stained hull on here so all can see! Gosh TFR normally removes everything. The boat must of been moored right outside a curry house!
If Y10 doesnt remove it either, You may need to try something as old fashioned as T-Cut or 3m hand glaze and elbow grease.
Never used this but i found this on a site http://www.marinemegastore.com/produ...t_id=MAICLE002
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14-10-2008, 11:32 AM
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#18
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Junior Member
Join Date: Mar 2008
Posts: 29
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try a few lbs of semtex hat ill defenetly shift it lol
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14-10-2008, 08:35 PM
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#19
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Registered User
Country: uk
Join Date: Nov 2006
Posts: 308
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Quote:
Originally Posted by Silversurfer
brick cleaner or brick acid from B&Q just paint on with a brush wear gloves protect galvernised trailer i wear eye protection as well. leave on for a couple of mins and hose off with plenty of water. Job done in 10mins max. Once dry rewax hull.
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YES BRICK ACID it doesn't damage the hull. Spray on with ( weed killer sprayer type thing) leave for 10 mins and wash of with water. TAKE CARE and don't get is close to any metals ie engine, rails etc....
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14-10-2008, 10:49 PM
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#20
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Registered User
Join Date: Jan 2008
Posts: 66
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where will i buy such a thing or is their a specific type to ask for,thanks.
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