Often asked: How To Repair Cracked Gel Coat On My Motorhome?

What causes gel coat to crack?

Spider cracks can indicate impact damage or serious structural problems that will need to be addressed to prevent spreading, but most often they result from relatively inflexible gelcoat that is too thick. Stress by thermal expansion or when bulkheads and liners were installed can cause minor flexing.

Can you paint over gelcoat?

If the gelcoat is in good condition with no major cracking or crazing, the job is relatively straightforward—clean and prepare the surface, apply an epoxy primer, sand the primer, remove the sanding residue and then apply the topcoat.

How do you fix cracks in fiberglass car?

Here’s how.

  1. Drill a tiny hole at each end of the crack. This will stop the crack from extending any further.
  2. Examine the crack.
  3. Wipe the crack with a dry rag to make sure it’s clean and dry.
  4. Fill the crack with a fair amount of fiberglass epoxy resin, using a plastic applicator.
  5. Let the epoxy dry for a day.

How do you remove oxidation from gel coat?

The use of marine grade formulas such as Crush Liquid Compound or Riptide Liquid Compound will quickly and effectively remove oxidation from the surface exposing fresh gel coat and fiberglass.

How do you fix deep scratches in gelcoat?

Surface scratches can be buffed out of gelcoat with polishing compound, but deep scratches must be filled. When the gelcoat surrounding a scratch is in good condition, the filler of choice is gelcoat paste, which provides both filler and finish in a single application — but not a single step.

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Does gelcoat need wax?

Gelcoat is available with or without wax. To cure properly and completely, gelcoat needs to be devoid of oxygen. Other products such as PVA (polyvinyl alcohol) can also be applied over gelcoat without wax to cure it. PVA is commonly applied by brush or spraying.

Is gel coat waterproof?

GelCoat is specially formulated to be water-resistant and highly durable. GelCoat cures hard with a self-leveling finish, even on vertical surfaces. This formula is also resistant to water blistering from frequent use.

How thick can gelcoat be applied?

Gelcoat can be applied in coats up to 24mils. For applications under the waterline a thickness of 20-24 mils aids in blister prevention and is better than thinner layers. Thicker layers are more prone to cracking under stress. Styrene vapors will inhibit and slow the cure of gelcoat.

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