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Can You Wax Fiberglass? Everything You Should Know

Yes, you should regularly wax the gel coat on fiberglass to protect it from damage. Fiberglass is a common material used for boat hulls, RV exteriors, auto bodies, and other applications exposed to the elements.

While the underlying fiberglass structure is strong, the outer gel coat layer is more vulnerable to UV rays, oxidation, staining, and other environmental threats.

Applying wax creates a protective barrier on the gel coat. The wax fills in pores and forms a glossy sealed surface, preventing moisture from seeping in.

This also reduces fading and chalking from constant sun exposure. Wax makes the gel coat surface slippery so dirt, droppings, and other contaminants have a harder time adhering.

Be sure to use a high-quality marine or RV wax designed for fiberglass gel coats. These waxes contain carnauba to provide a deep, wet-looking shine versus synthetic polymer waxes.

Follow the manufacturer’s directions, using smooth circular motions to apply a thin even coat over the entire gel coat surface. Let it haze, then buff off with a soft cloth.

==>> Learn how to wax your boat gelcoat here.

For best results, wax the gel coat two to three times per year. Wax when the surface is cool and clean. If oxidation or chalking has occurred, use a rubbing compound first to smooth the gel coat before waxing.

Take care not to burn through the thin resin layer when buffing chalky areas.

==>> Can you paint a fiberglass boat?

Bottom Line

Keeping the gel coat waxed maintains the original gloss and color for years. It also makes washing easier since contaminants won’t cling as strongly. Use only boat or RV cleaners, not harsh detergents that can strip off protective wax.

With regular waxing and proper maintenance, your fiberglass gel coat will continue looking shiny and new.

I hope you have gained value from this article. If you have any questions, you can leave them in the comment section below.

==>> How do you make fiberglass last longer?

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