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⚡ Thin it right, spray it smooth — the pro’s secret weapon!
Fiberglass Supply Depot’s Styrene Monomer Thinner is a pure, professional-grade solvent designed to precisely thin polyester resin and gelcoat. Ideal for spray applications, it enhances flow and surface finish without compromising cure quality. Compatible with a wide range of polyester systems used in marine, automotive, and industrial composites, this pint-sized thinner offers controlled mixing for expert users seeking flawless composite results.
| Customer Reviews | 4.5 out of 5 stars 109 Reviews |
M**X
Quality product
I’ve bought from this company for years never disappointed
A**I
Works
Allows thinning gel coat so it can be shot from a spray gun.
D**.
Paint
Arrived on time did what it was supposed to do
J**D
Fiberglass products
Incredible people to deal with. Great product. Buy on the regular. Used to make monster truck bodies.
C**E
Perfect for thinning gelcoat paint
Perfect for thinning gel coat paint
A**R
Great quality
Everything I ordered from this company has been excellent
M**I
Necessary for the process I'm going to do.
Haven't used it yet, but just being on the shelf, unopened, in the zip lock bag it was shipped in, it sure permiates the sir. This will be my first time spraying poly resin and I also picked up all the ppe I'll need.
J**R
Great product
Product was as described
Trustpilot
1 week ago
3 weeks ago