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  • Fixing Gel Coat Spider Cracks 2002 Malibu VLX

    • Year: 2002 Brand: Malibu Model / Trim: VLX Cost: $0-$249

    I found a bunch of spider cracks on the bottom of the boat.  I have no idea how long they had been there.  Looks it had been awhile and I didnt check under the boat when I bought it.  At this point I had taken a deposit from I guy that bought it from California sight unseen.. I didn't want to sell it to the next guy in this shape so I figured I'd fix the cracks before he picked it up


    I ground out the cracks using a Dremmel tool, then filled the cracks with color matched gelcoat material from Spectrum Color.  Malibu had used two different colors of white in 2002.  "Moon Beam" or "Bright White"


    I couldn't find a Malibu color chart so I took a chance and ordered a quart of the bright white. 



    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 from sanding into the existing gelcoat.  I used a paint brush to fill the crack with as much gelcoat as I could get in there.  The gelcoat is pretty runny and you aren't able to get much to stick with it being on the underside of the boat.  In hindsight I should have used plastic to help force it into the crack.  I keep thinking that one more coat with a paint brush would do it...I ended up filling and sanding it 10 times.  For the final finish I  sanded with 180, 300 1000, 1500 grit and then used a polisher with Meguiars Mirror Glaze #49 Oxidation Remover to buff to a shine. 


    User Feedback

    Awesome job.   I'll post mine too... although my gelcoat was black and you can kinda see the cracks still even though it's perfectly smooth and was color matched.   I think another summer in the sun will fix that though... and yes I'm the only one who even notices/sees it.    Much better than cracks!

    Another good trick is to drill a tiny hole at the end of the crack, to keep the underlying crack from continuing.  Then fill in with gel coat, etc.

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