Gel coat problems, need assistance
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Gel coat problems, need assistance

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    Default Gel coat problems, need assistance

    I have a 77 spectra 20 jet. Great family cruiser. The top of the boat from rub rail is getting the long wide cracks. Alligatoring on deck. . My delema is how to fix this. Do I send for blasting to remove gel? Have a new deck built from a mold. Or shit can the hull and re rig another.

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    Senior Member OFFSHORE GINGER's Avatar
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    Pics would really help .

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    Offshore I'm glad you replied. I know you will know. I'm taking the photos today and post

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    Quote Originally Posted by Nomofun View Post
    I have a 77 spectra 20 jet. Great family cruiser. The top of the boat from rub rail is getting the long wide cracks. Alligatoring on deck. . My delema is how to fix this. Do I send for blasting to remove gel? Have a new deck built from a mold. Or shit can the hull and re rig another.
    To repair these, you will need to get down to glass, any surface repairs will just come back. here are a couple picks of the process i did with my Spectra.
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    Last edited by Sanger-Spectra; 09-17-2013 at 09:49 AM.

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    Gelcoat/resin crack propagation can be caused by many things, the worst of which would be the fact that the resin matrix has reached its use life or has been degraded by some means. The best scenario would be the gelcoat is the only part of the system that has failed. Its not always fixable, yet some do and believe its safe. It will be important to see the condition of the matrix system under the gel and go from that point. You should also plan on looking at other portions of the boat, unless presuming that this issue is just UV/age related is acceptable.

    Like Offshore said post up them pics
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    Here is pics. Again it's all over
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    RPB
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    Top pic....zoom out what part of deck is this?
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    this is why I asked cause i have heard that spectra made a change in resin and gel back then and had tons of issues till they realized it and went back to older system. i also look at cost. a new deck in gel is ? vs repr. a new hull is ? vs painting and fixing this one. . the hull seems good. this is a 1/4 stringer hull.

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    RPB
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    Go ahead and peel one of those chips off and lets see whats under it.
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    Quote Originally Posted by RPB View Post
    Go ahead and peel one of those chips off and lets see whats under it.
    I agree , and over the years ........i have seen way to many older boats facing problems with cracks because the gel was sprayed on way to thick because something as simple as a Mil gauge was not used during the initial application of the Gel in the mold .
    Last edited by OFFSHORE GINGER; 09-18-2013 at 03:32 PM.

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    Quote Originally Posted by Sanger-Spectra View Post
    To repair these, you will need to get down to glass, any surface repairs will just come back. here are a couple picks of the process i did with my Spectra.
    could you please explain the process that you used to do this and how did it turn out ? im under the impression that you grind down to glass then lay a layer of glass over the old glass but then how do you cover the new glass to hide the glasswork and what about the edges don't they want to peel up after some time ?

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    Quote Originally Posted by smokinjoe View Post
    could you please explain the process that you used to do this and how did it turn out ? im under the impression that you grind down to glass then lay a layer of glass over the old glass but then how do you cover the new glass to hide the glasswork and what about the edges don't they want to peel up after some time ?
    Hey Joe, we used 36 grit 9" disks on a low speed buffer / grinder, took the surface down into glass and laid up two layers of 1oz matt and 1 layer of cloth. The edges are freyed and laid over the cap. This was a project I wanted to lean how to do so I took some extra steps to learn and do a few things. I was getting rid of all the original mounting holes, gas fills, vents ect so I wanted a virgin surface. I actually capped the boat before we did the top deck, so it was in essence capped twice. The key is the grinding enough material away to be able to lay down new material and not have a ridge. Once the glass is down you finish with a couple resin coats and finally a wax coat so you can sand and shape. Again this is were your grinding prep comes in because you don't want to be blocking glass, just the final resin coats to shape. We gel coated the entie boat once we were done as well and used that for a primer, I had 95% of all the gel coat sanded off this thing top and bottom as well, boat wasn't a basket case but close to it and I had a desire to learn how to do glass work.
    Here are a few pics of the finished product after initially blocked (don't laugh at my guide coat, it was really late and i think i was a little loopy), painted and then with color.

    There are many ways to do this, and a lot of different materials as well, this is old school and I am sure others will comment on using some more modern materials.
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    Last edited by Sanger-Spectra; 09-22-2013 at 04:21 PM.

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    I like it looks good !

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    Nothing wrong with poly and standard glass. I prefer VE resin and fillers and they are compatible with poly. Once epoxy is used it can complicate future repairs. Ask me how I know this!

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