Gelcoat finish restoration

kenmyfam

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Aug 10, 2006
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14,392
Just got the mechanical side of the boat ready for the water but noticed that some of the finish is dull and has a whitish residue that will not wax out. I think I read somewhere that you can use either scotchbrite or comet ?? to bring back the colour and then a good couple of coats of wax to make it shine. Can anyone help me out with this and any other ideas or suggestions would be more than welcome.
Thank You,
Dull Hull in Ontario !!!
 

threedeesmax

Petty Officer 2nd Class
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Apr 15, 2005
Messages
110
Re: Gelcoat finish restoration

I followed Mark42's method of using the Scotch-Brite pads AND Comet cleanser. You keep the boat's surface wet. Soak up some water in a Scotch-Brite pad and then liberally sprinkle it with Comet cleanser. Then you scrub, and scrub, and scrub some more. You'll scrub off the oxidized layer. Keep rinsing out your Scotch-Brite pad. It'll turn the color of your boat as it removes the oxidation.

Then you use a good rubbing compound on your boat, by hand or with a buffer. Do NOT use a buffing pad on a drill, because you'll possibly burn all the way through the gelcoat. After you're finished with the rubbing compound, you rub in a coat of good polishing compound. Then, finally, apply two or three coats of wax.

It works. I was quite satisfied with the results on my badly ozidized 1961 Red Fish Shark.

If you find that the Scotch-Brite pad treatment doesn't meet your expectations, you can wet-sand your boat, and then follow the rubbing compound/polishing compound/wax steps.
 

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kenmyfam

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Re: Gelcoat finish restoration

Thanks for the input. Yours looks great. I will be doing some scotchbrite / comet shopping tomorrow. I have the water already !!!! LOL
 

threedeesmax

Petty Officer 2nd Class
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Re: Gelcoat finish restoration

Kenmyfam, here's a photo that shows how bad the gelcoat looked BEFORE I did the Scotch-Brite treatment:
 

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kenmyfam

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Re: Gelcoat finish restoration

Wow, what a difference. Thanks for that. Great looking boat you have there. I would like to see more photos if you have them.
 

threedeesmax

Petty Officer 2nd Class
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Re: Gelcoat finish restoration

Here are a couple of 'after' pics.
 

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threedeesmax

Petty Officer 2nd Class
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Re: Gelcoat finish restoration

Sorry for the repeat - here's another.
 

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kenmyfam

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Re: Gelcoat finish restoration

Thanks for those. What size motor is on there and what year ??
 

threedeesmax

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Re: Gelcoat finish restoration

That's a Mercury Mark 58ae motor, either 1958 or 1959 (serial number 1197249). It is an inline 4-cylinder, 44 cubic inches, 45 HP.

I've been working on this motor for several days. I've cleaned everything up, installed kits in both carburetors and a kit in the fuel pump, refurbed the magneto, new plug wires and plugs, repainted the starter motor, replaced hoses and wiring. Today my nephew took the lower unit to a machine shop where he works and used one of their spanner wrenches to remove the water pump cover. Tomorrow I'll install a new water pump impeller and start her up, barring unforeseen problems.

It better start right up. I'm so pumped up about getting this motor in the water again. The compression is downright excellent: #1 = 122 lbs, #2 = 119 lbs, #3 = 119 lbs, and #4 = 120 lbs. It should run smooth as silk.
 

kenmyfam

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Re: Gelcoat finish restoration

Sounds like you have a winner there. Very nice. When do you plan taking her out for a spin ???
By the way, I started the scotchbrite, comet, rubbing compound, wax thing tonight. My arms are sore, I drank a lot of beer as I worked up a terrific thirst !!!.........and as far as I have got is looking great. I started with the worst areas first and so it should only get easier from here.
Thanks for the advice. The neighbours will think I have a new boat shortly. I will post pics of before and after when I am done.
 

threedeesmax

Petty Officer 2nd Class
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Re: Gelcoat finish restoration

Kenmyfam, as soon as I get the boat started, I'm going to head to the lake and try it out, set the idle screw adjustments, etc. I have a brand-new battery so I don't get surprised.

Congrats on scrubbing off the oxidation. You (and your neighbors) will be amazed when the last coat of wax is finished and you stand back and look at the boat in good light. You may need sunglasses.. :)

Glad to be of assistance, but thank Mark42 - I got this system from him.

My boat is approaching its 50th anniversary, and the poor old gelcoat looks very nice from 10 feet away. But when you get up close, you'll see crazing, and deep spiderwebbing under the spotlights and in a couple of other areas. There are also three or four small chips that are missing, and you can see just how thin the gelcoat is.

After this boating season and finances allowing, I'm gonna grind all the spiderwebbing and crazing down to the fiberglass beneath, and then fill, fair, and sand. Then I'll either have it re-gelcoated 'Buckskin Tan' as it is now, or match one of the five or six original colors, from the brochures (see attachments). This summer I plan to have new seat upholstery done in the original style and colors, white and silver. The boat has fiberglass molded-in back-to-back bucket seats for four passengers - way cool for 1961.
 

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I/O WALDO

Petty Officer 1st Class
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Nov 16, 2005
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320
Re: Gelcoat finish restoration

I like the 400grit, powered wet sand method.less effort and longer lasting results on a vessel that is always outside.
 

threedeesmax

Petty Officer 2nd Class
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Apr 15, 2005
Messages
110
Re: Gelcoat finish restoration

I/O Waldo, the wet-sanding method is more effective than the Scotch-Brite/Comet method, if your boat is extremely oxidized. For light to medium oxidation the ScotchBrite method works just fine for a season or two.

I decided a couple of days ago that I wanted to go deeper into the gelcoat than a Scotch-Brite pad would penetrate, so my nephew and I have gotten started with wet-sanding. We are doing it all by hand, no power assistance because of all the curves on this boat. Otherwise we might burn right through the gelcoat.

We started out with 320-grit and will progress to finer sandpaper grits. On some rough areas we used a coarser grit. Then we'll use rubbing compound, polish, then wax. It's looking very good. But next year it'll be either re-gelcoated or painted. Maybe "1956 Thunderbird Lipstick Red" with ghost flames...
 

kenmyfam

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Re: Gelcoat finish restoration

Well, I ground to a halt with mine tonight after work. Into it for about 20 minutes then it started pouring with rain !!! Oh well I get to watch the hockey games now !!! and back to it tomorrow.
 

I/O WALDO

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Re: Gelcoat finish restoration

Yep! You can mess up quick with a sander on corners!!!!
 

kenmyfam

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Re: Gelcoat finish restoration

Yep! You can mess up quick with a sander on corners!!!!
That is one reason I am sticking with the scotchbrite, comet method and all by hand. Dont want any nasty suprises and although slow I will get there in the end.
 
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