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I plan to use this product for a gloss coat, Can I use this for fiberglass repair as well? Is this product cleaned up with Zylene?
The Riechold Polyester Gloss Resin is only suitable for use as a glosscoat or second hotcoat. It is brittle and should not be used for fiberglass repair. Silmar 249B Laminating Resin is great for fiberglass repair. All polyester resin products should be cleaned up with acetone as is it a much stronger solvent than xylene.
Can I use the polyester gloss resin instead of the epoxy resin on a surfboard>
Yes you can use polyester resin to gloss coat an epoxy sealcoat but it is not advisable since there is no chemical bond between the two different resins. The polyester resin gloss coat may chip off over time. If you are to use the Riechold gloss on epoxy we recommend sanding the sealcoat with 60 or 80 grit to give the resin a mechanical bond to the board.
Why is it not preferred to just leave the gloss that the resin cures with? What is the benefit to going through all 8f the sanding to bring it back to a gloss?
You can certainly leave the gloss unsanded if it looks good to you. It's all a matter of preference when choosing how shiney and perfect looking you make your board.