Yes. You can use a normal gun.
Personally I don't favour using flowcoat since you can't put another coat on top.
So I used normal gel to allow mutiple coats/touch ups etc until I was happy.
Getting the right amount of thinners, atomisation, air pressure etc are all paramount.
Once sprayed on, liberally spray lots of PVA mould release over the top to seal it allowing the gel to cure properly.
Once all cured, wash the PVA off.
You will need to hand finish (unless you're lots better at it than me) with wet & dry, cutting compound etc to get the finish to be good enough.
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