They can occur in any form of fiberglass, including cars, boats and swimming pools. Small cracks form in the outer surface of the fiberglass, spreading out from a central point like a spiderweb. These cracks do not affect the structural integrity of the fiberglass, but are an aesthetic issue. Fortunately, spider cracks are not difficult to repair. The other repair for spider cracks involves a little more work! Start by wiping down the area with acetone and sanding the damaged gel-coat down to the fiberglass. Try not to remove any of the fiberglass resin or cloth! Next wipe down the area with acetone again! Color match gel-coat with your hull color. I restored a Black Gold Bell Wildfire that had a lot of fine spider cracks in the clear polyester gel coat. The appearance was considerably improved by wet sanding the entire hull down to 2000 grit, then applying several thin coats of System Three Clear Coat epoxy, which is a very low viscosity epoxy.
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Spider cracks are a form of fiberglass damage that occurs from minor flexing or impacts. They can occur in any form of fiberglass, including cars, boats and swimming pools. Small cracks form in the outer surface of the fiberglass, spreading out from a central point like a spiderweb. These cracks do not affect the structural integrity of the fiberglass, but are an aesthetic issue. Fortunately, spider cracks are not difficult to repair.
Step 1
Clean the area with acetone and a rag to remove any dirt or other impurities.
Step 2
Sand the damaged area with 100-grit sandpaper to roughen the surface. You can sand by hand or with an electric sander.
Step 3
Wash the area with acetone a second time to remove all sanding dust.
Step 4
Mask off the area around the cracks with masking tape and plaster to protect against drips.
Step 5
Pull all of the loose bristles out of a cheap paint brush. Loose bristles may become embedded in the gelcoat.
Step 6
Measure a small amount of gelcoat, which is a thick form of fiberglass resin, into a paper bucket. If the fiberglass will be exposed to water, the gelcoat should be marine grade.
Step 7
Mix catalyst into the gelcoat following the instructions on the container. Precision is important: if you add too much catalyst the gelcoat will cure faster than it can be used, but if you add too little it won't cure at all.
Step 8
Brush a thin layer of gelcoat onto the sanded area, feathering it out a bit onto the surrounding fiberglass surface.
Step 9
Allow the gelcoat to sit for three hours, then spray it lightly with Polyvinal Alcohol to help it fully cure.
Step 10
Step 11
Step 12
Sand the area with 300-grit sandpaper to begin smoothing it. Re-sand it with 600-grit, then 900-grit and so on. Keep jumping 300 grit at a time until the repeated sanding has produced as smooth of a finish as you require.
Step 13
Prime and paint the fiberglass to match the surrounding surface if needed.
Warnings
Gelcoat Spider Crack Repair
- Wear rubber gloves when working with gelcoat.
- Work in a well-ventilated area.
Items you will need
Spider Crack
- Acetone
- Rag
- Sandpaper
- Electric sander (optional)
- Masking tape
- Plastic sheeting
- Paintbrush
- Gelcoat
- Paper bucket
- Catalyst
- Mixing stick
- Polyvinyl Alcohol
- Spray gun
- Soapy water and sponge
- Primer and paint (optional)
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