Gel coat isn't going to do anything for you that a ordinary two part epoxy
paint can't do better..

I recommend staying away from white because it doesn't stay white very
long..

Sherman Williams has a epoxy cement patio paint that comes in a terracotta
color. It is much cheaper than marine paint (I don't remember the price but
it is a bargin)..

I'm using some surplus ProLine epoxy polymide and it is standing up well to
all abuse and gives an appearance that reminds me of similar color used in
my ole navy ships..


--
My opinion and experience. FWIW

Steve
s/v Good Intentions

I should have mentioned the obvious need to clean and degrease the bilge..
Even if it were virgin glass surface, it would still have wax on it..

I would hate to see anyone use large quantities of acetone in the bilge. But
I believe you can clean it adequately with TSP to clean and remove the
grease and ordinary dirt.. Followed by plenty of ventilation and a wipe down
with acetone. Just be careful..

Steve