Gel Coat Spider Crack Repair

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Spider Cracks. Spider cracks are small, hairlike cracks that appear on the gel-coat of boats. They are also referred to as 'crazing'. These cracks are generally cosmetic, and indicate flexing of the hull. Sometimes, however, spider cracks offer a path for water to get into contact with the fiberglass structure under the gel-coat. MagicEzy Hairline Fix is a revolutionary pre-colored fiberglass and gelcoat repair product that fixes and colors fine stress cracks (spider cracks), and hairline fractures fast in one application. It penetrates deeply into the pores of even the finest of cracks for ultra tough adhesion and durability.

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.

Fixing Gel Coat Spider Cracks 2002 Malibu VLX Share your completed boat projects! DIY or Professional Installs. Imagine a single giant database of boat projects for all brands, organized by category, boat type or budget. I didn't snap any pics of the repair process but what I did was use a layer of masking tape around the cracks to keep. 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.

Fiberglass spider crack repair

Step 1

Clean the area with acetone and a rag to remove any dirt or other impurities.

Re: repairing spider cracks in gel coat I have worked on many boats with spider cracks, the best method i have used is a dremel tool to gouge the cracks and fill them with a gelcoat paste made with gelcoat and glass bubbles works wonders, as for sand paper- you will have to change grits as you sand and fill. It looks like someone took a paint brush with white paint and painted the bottom. I've looked through your site and am wondering if it is spider cracks in the gel coat from the drop or the leveling or possible from a faulty pool shell.

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.

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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. Design doll license. If the fiberglass will be exposed to water, the gelcoat should be marine grade.

Step 7

Gelcoat Spider Crack Repair Paste

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.

Fiberglass Spider Crack Repair

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

Crack

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

  • Wear rubber gloves when working with gelcoat.
  • Work in a well-ventilated area.

Items you will need

Boat Gelcoat Spider Crack Repair

  • 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)

Cracks In Gelcoat On Boat

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Spider Crack

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