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Resin Additives

For prices, please contact us. For a quick overview of the product, read below. For details, click each respective product link.

Catalyst (Oxidizer Yellow Label)

Hardener for Polyester Resins and Gelcoats. MEKP 9% active oxygen.

* Note: Over 8 oz. cannot be shipped UPS * Always do a trial run if you are unsure amount of catalyst. * See catalyst chart in wiki*

Surfacing Agent (Flammable Red Label)

Add to no wax resins and gelcoats for tack free cure on final coats. Add 5% to resins and gelcoats. *Note - see surfacing agent pitfalls in Hand Lay Up guide.

Mold Release

Paste wax.

Styrene (Flammable Red Label)

Excellent thinning agent for use with polyester resins and gelcoats. Used to wipe down cured waxed resin to remove wax.

Thixotropic Powder

Used to thicken polyester resins and gelcoats to desired viscosity (Konasil, Cabosil, Aerosil)


Inexpensive filler for making a sandable putty. Add up to 40% by weight.

Polyvinyl Alcohol (Flammable Red Label)

PVA sprays onto molds and works as a release agent. Also, sprayed onto no wax gelcoat as an air inhibitor. * Comes in Clear and Red. Both are Water Soluble for Easy Clean Up.


Mix with resins to make lightweight, easy to sand and work with farring compounds.

Pigment Dispersion (Flammable Red Label)

For tinting polyester resins and gelcoats. ** CAUTION: Use Sparingly **

Acetone (Flammable Red Label)

Solvent for easy clean-up. * Caution: Very Flammable! *