You can sand the old gelcoat as prep. Make sure it is free of any waxes
first. I'm not sure what to recomend as a thinner. I do know that acetone
is really dangerous and I would not use it for a thinner.

wrote in message
ups.com...
I am about to repair some areas of the gelcoat skin of my fiberglass
boat. I am supposed to use something called "styrene" to be brushed on
the old gelcoat in order re-activate the gelcoat for a better bonding
between the old and the new gelcoat. And I am also supposed to use it
as a thinner to thin the gelcoat before spraying it using a Preval
spray gun. But I cannot find it in Home Depot or local marine supply
stores (such as BoaterWorld). Does it go by a different name? Where
can I find it? Can I use acetone instead?

Thanks in advance for any help.

Jay Chan