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Old 21-01-2019, 09:00   #1
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Oxidized gelcoat ???

My elderly, blue hull, Maple Leaf 48 is badly oxidized. Not wanting to spend a lot to hire a crew ... can anyone suggest a lightweight electric, or air, polisher and compound to get the hull back to original colour AND, since the hull is not new-boat fair, a sealer that is not like a wax shine ? THANKS
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Old 21-01-2019, 09:23   #2
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Re: Oxidized gelcoat ???

Dewalt polisher. 3M system liquid componds and 3M marine paste wax.
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Old 21-01-2019, 09:33   #3
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Re: Oxidized gelcoat ???

If it’s badly oxidized, you may have to wet sand it.

https://www.practical-sailor.com/blo...t-11381-1.html
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Old 21-01-2019, 12:54   #4
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Re: Oxidized gelcoat ???

DON'T wet sand it. Gelcoat is actually microscopic bubbles, and when you sand it, the bubbles get opened up, and ever after will fill with dirt. Once you hit it with rubbing compound, you're on the downhill side, "improvement" will only be temporary.

I realize this is not an answer to your specific question, but how we dealt with the problem in the past is with a product called PolyGlo. It is a two step deal, a mild acid wash to remove all stain, then a polymer coating. You apply both with an application pad that is also supplied by them, we used a long handle like a floor mop, and it lasts about a year. We would do it at haulout time, although it can be done in the water, at the dock. There is another product, called TSRW (This Stuff Really Works), which does the same thing. This approach to your problem will be less expensive and less labor intensive.

Good look with it.

Ann
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Old 21-01-2019, 13:57   #5
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Re: Oxidized gelcoat ???

Polyglow and it's clones are a last resort and even then, only a temporary reprieve.

Judicious wet sanding is a reasonable option and if done properly, will way outlast any of the plastic-looking stuff. But before wet sanding which is an aggressive method, try polishing the top sides within any number of products specifically made for this purpose.

And be sure it is in fact colored gel coat and not paint which requires a different approach.
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Old 21-01-2019, 16:22   #6
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Re: Oxidized gelcoat ???

I had this on our HR 53 a few years ago . We wet sanded , 1000 ,3000, 5000 ,7000 then polish . It looked nice for a few months , but soon faded back .
We then had it painted with Alwgrip or maybe it was Alw2000 . Very good ,highly recommend.
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Old 21-01-2019, 16:30   #7
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Re: Oxidized gelcoat ???

A regular buffer and 3m Imperial compound in the purple bottle works absolute wonders. Try it you will be very happy with it. I was when 5 years ago I tried it on my gelcoat that had absolutely no shine when I got the boat. It is still shining nicely.
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Old 21-01-2019, 19:03   #8
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Re: Oxidized gelcoat ???

Quote:
Originally Posted by JPA Cate View Post
DON'T wet sand it. Gelcoat is actually microscopic bubbles, and when you sand it, the bubbles get opened up, and ever after will fill with dirt. Once you hit it with rubbing compound, you're on the downhill side, "improvement" will only be temporary.

I realize this is not an answer to your specific question, but how we dealt with the problem in the past is with a product called PolyGlo. It is a two step deal, a mild acid wash to remove all stain, then a polymer coating. You apply both with an application pad that is also supplied by them, we used a long handle like a floor mop, and it lasts about a year. We would do it at haulout time, although it can be done in the water, at the dock. There is another product, called TSRW (This Stuff Really Works), which does the same thing. This approach to your problem will be less expensive and less labor intensive.

Good look with it.

Ann
Following a good rub out using two of the 3M products and 3M wax, our hull looks great following a minimum effort polishing with just water and the annual wax. Never had a problem with “bubbles filling with dirt.” Maybe not all gell coats are created equal? I’ve never heard of that being a problem.
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Old 21-01-2019, 23:30   #9
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Re: Oxidized gelcoat ???

Wash down with soap and water let dry. Then wet down with muratic acid or oxalic acid rinse with lots of water followed by a waxing done deal.
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Old 23-01-2019, 12:30   #10
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Re: Oxidized gelcoat ???

Quote:
Originally Posted by Gary Mc View Post
A regular buffer and 3m Imperial compound in the purple bottle works absolute wonders. Try it you will be very happy with it. I was when 5 years ago I tried it on my gelcoat that had absolutely no shine when I got the boat. It is still shining nicely.
I bought the cheap Chicago DA buffer at Harbor freight. 3m Imperial was amazing, 14 months and my hull still has that nice glow to it.
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Old 23-01-2019, 12:43   #11
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Re: Oxidized gelcoat ???

I like 3M Finesse It ll. Not abrasive and shines right up. Apply with a damp polisher wheel. Of course you can compound, wet sand etc, but you run the risk of breaking through to dark under color. No protective coat lasts very long though. ... unless you hard wax it. And that is temporary too.
I know some people have used Daly's Sea Fin on fibreglass... I guess it works well for a quick shine up... like when you are selling your boat. But I haven't done that.
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Old 24-01-2019, 10:20   #12
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Re: Oxidized gelcoat ???

Google “ marine how to “ ! On that site is a detailed how to on buffing gelcoat !
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Old 24-01-2019, 10:43   #13
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Re: Oxidized gelcoat ???

Quote:
Originally Posted by Sparkplug1939 View Post
Google “ marine how to “ ! On that site is a detailed how to on buffing gelcoat !

Same info here:


https://forums.sailboatowners.com/in...ff-wax.117266/
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Old 29-03-2019, 00:59   #14
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Re: Oxidized gelcoat ???

I use Aquabuff with the help of a buffer.
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