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HELP - Gelcoat Repair Discoloration

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HELP - Gelcoat Repair Discoloration

Old 09-06-2019, 06:50 PM
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Default HELP - Gelcoat Repair Discoloration

I mixed up some gel coat to fix some chips and holes around the boat. In every spot, when I go to sand the new gelcoat down, the old gel around the repair site discolors and turns almost orange. I'm wet sanding.

NONE of the instructional videos mentioned that this could happen. Any idea what I'm doing wrong or how to fix the discoloring now??


Thanks in Advance.
Old 09-06-2019, 11:13 PM
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Keep in mind, the gelcoat is porous, and you may be sanding the surface, but perhaps there is still residue getting down in the gelcoat.
If it may be residue from the sand paper mixing with gel, you might try a scrub/wash with plenty of fresh water rinsing.
If that has no impact, I would wonder if you have some other type of residue showing up like a stain?
Believe it or not, sometimes a little Lysol toilet bowl cleaner can work wonders to clean gelcoat.
It may be worth trying if a good scrubbing and rinse won't take it off.
Good luck.
Old 09-28-2019, 10:22 AM
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As you can see the area around the gelcoat repair discolors when sanded.
Old 09-28-2019, 10:56 AM
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you are likely bringing out the boats original color, what kind of boat is it? something thats an off white like a parker or grady white?
Old 09-28-2019, 12:30 PM
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Itís a Key West 196 Bay Reef
Old 09-28-2019, 12:34 PM
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Are youíre you sanding through the gel coat?

post pics, youíll get better answers
Old 09-28-2019, 04:13 PM
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Is the sand paper new, or was it used previously, contaminated with steel and now leaving iron that will rust when it reacts with the catalyst?
Old 09-28-2019, 05:40 PM
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Originally Posted by Bullshipper View Post
Is the sand paper new, or was it used previously, contaminated with steel and now leaving iron that will rust when it reacts with the catalyst?
I've seen that done on stainless in a pharma plant. It's a real sht show.



Old 09-28-2019, 05:44 PM
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If itís rust, one of various rust removing products should get rid of it. If he sanded through the gel coat, itís re-spray time.
Old 09-28-2019, 07:21 PM
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I think he is seeing the original color. This is the reality of gelcoat repair.
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Old 09-28-2019, 07:44 PM
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Originally Posted by Raybo Marine NY View Post
I think he is seeing the original color. This is the reality of gelcoat repair.
.

Iím assuming he knows the original color, although this may be an incorrect thought.

Heís been back here today, but hasnít offered any new information or updated anything.
Old 09-28-2019, 07:54 PM
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Original color meaning what you see when you start sanding it aggressive enough to bring it out

if sanded through I think he would be asking why he is seeing dark/black rings ?
Old 09-28-2019, 09:12 PM
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Yes, original color, not the faded and chalky color on the surface. Iím thinking he would know what color that was/is.

The underlining resin is typically an amber color, if light shines through it could appear orangish, although with no light it would appear dark.

It could also be a backup gel coat, overspray on the backside from a stripe, or a barrier coat.

For that matter it could be a painted boat and heís seeing primer.

No way to know until he responds.

Last edited by ondarvr1; 09-28-2019 at 09:22 PM.
Old 09-28-2019, 09:17 PM
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Could be red resin under the gel coat, rust red or slightly red is why we need a photo like Ondavr said
Old 10-04-2019, 08:46 PM
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I canít upload pics until Iíve posted 10 times apparently.
Old 10-04-2019, 08:49 PM
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I think itís the original gelcoat color (posting replies to reach 10)
Old 10-04-2019, 09:18 PM
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As Raybo said. I had the same issue with an old Mako. Color wasnít a lot different, but it was different. Minor tints stand out when next to white.

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