Why paint instead of gelcoat? - Page 5 - SailNet Community
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post #41 of 111 Old 07-31-2012
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Re: Why paint instead of gelcoat?

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Originally Posted by RichH View Post
Here's a hint to do a better job with the PreVal sprayers:
1. Go to a paint store and get a supply of small conical 'paint strainers' - finest 'mesh' size you can obtain.
2. Mix and thin the Gel to the consistency you desire .... dont add the catalyst, yet.
3. Filter the uncatalyzed gel through the paint strainer
4. REMOVE the teeny stainer on the PreVal suction tube .... throw it away. Its too small and easily clogs.
5. Add catalyst to the filtered gel, etc. etc. and spray.

The result will be 'better' and heavier spray (no restriction due to the teeny Preval 'strainer'), and the Preval 'strainer' wont clog up during the operation. etc. ... although sometimes when the gel 'begins' to kick it will clog the spray orfice.

Good Luck.

;-)
thanks for the tips!

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post #42 of 111 Old 07-31-2012
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Re: Why paint instead of gelcoat?

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Originally Posted by SloopJonB View Post
Nope - 40 year old, thoroughly oxidized off-white. Why would dark colours be any different? Colour matching is colour matching.
I don't think you can color match oxidized dark blue gelcoat, expecially when it gets old and milky. White seems like it just takes on a different version of white.


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post #43 of 111 Old 08-01-2012
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Re: Why paint instead of gelcoat?

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I don't think you can color match oxidized dark blue gelcoat, expecially when it gets old and milky. White seems like it just takes on a different version of white.
Colour sanding - wet 600 grit then compounding with a buffer should bring back the dark blue - it worked on my 40 year old, dark blue boot top.

If colour sanding and polishing won't bring it back to at least acceptable condition, it's time to recoat, not touch up. If it's that bad, why would you want to bother with touching up scratches? Conversely, why would you care if they didn't match?

I, myself, personally intend to continue being outspoken and opinionated, intolerant of all fanatics, fools and ignoramuses, deeply suspicious of all those who have "found the answer" and on my bad days, downright rude.
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post #44 of 111 Old 08-01-2012
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Re: Why paint instead of gelcoat?

Sloop. I will take your word for it that it can be done. However, I often see it isn't done. I don't think oxidized gelcoat looks so bad that one wouldn't care about a serious scratch. Just think it's hard to match in and you're saying you can bring it back with wet sanding and compound before recoating. I would have thought I would see more rejuvenating going on, scratch or not, but again, I will take your word on it.


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post #45 of 111 Old 08-01-2012
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Re: Why paint instead of gelcoat?

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I would have thought I would see more rejuvenating going on, scratch or not, but again, I will take your word on it.
Did I mention that it took me a month to do the hull of my 43'?

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post #46 of 111 Old 08-01-2012
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Re: Why paint instead of gelcoat?

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... 5. Add catalyst to the filtered gel, etc. etc. and spray.
And remember that when you do your calculations on how much catalyst to add, you need to base them on the volume of the thinned gel and not the original amount taken out of the can.

Don't ask me how I know this...
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post #47 of 111 Old 08-01-2012
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Re: Why paint instead of gelcoat?

Wow, a lot of opinons on both sides, no question a new layer of gelcoat will be better, but I used to work for a plastics, shop, I have gallons of resin in my garage that I regularly fabricate fiberglass objects with, as well as boat repairs....

a few weeks ago I decided to refinish my boat.

I gel coated the gouges, sanded flat, then painted the hull with a marine enamel, I did the same to the deck mixed with some nonskid. It only took a weekend, and it came out great.

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post #48 of 111 Old 08-01-2012
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Re: Why paint instead of gelcoat?

Ok I am totally confused about paint vs gel coat.

Years ago I re-built an old neglected 13 foot boston whaler. I wanted to re gel coat but everyone I spoke with said forget it, it is not done, just paint. That's what I did.

I never see boat yards advertise to re gel coat. They all advertise two part paint. So are there boat yards that would re gel coat? If cost is an issue, what % increase in cost would there be to gel coat instead of paint?
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Re: Why paint instead of gelcoat?

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Ok I am totally confused about paint vs gel coat.

Years ago I re-built an old neglected 13 foot boston whaler. I wanted to re gel coat but everyone I spoke with said forget it, it is not done, just paint. That's what I did.

I never see boat yards advertise to re gel coat. They all advertise two part paint. So are there boat yards that would re gel coat? If cost is an issue, what % increase in cost would there be to gel coat instead of paint?
Regards
Years ago it wasn't done because the resins of the time orange peeled badly when used outside of a mould. It took a very large amount of sanding and polishing to get a nice surface. New resins are available that don't do it.

I had some extensive touching up done on my hull to cover repaired scrapes, thin spots etc. Probably more than 5% of the hull needed spraying and it cost me $100 which included the gel and the colour matching.

Most of the cost of recoating a hull is the prep work which anybody is capable of doing - it just takes time and brute labour. Getting someone in to just spray the coating is usually only a few $hundred.

If you haven't ever sanded anything like a boat or a car, it would be advisable to do some reading on proper technique and materials beforehand. If you prep it properly it will come out better than new in almost all cases.

I, myself, personally intend to continue being outspoken and opinionated, intolerant of all fanatics, fools and ignoramuses, deeply suspicious of all those who have "found the answer" and on my bad days, downright rude.
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post #50 of 111 Old 08-01-2012
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I agree, educate yourself. Frankly if the hull is in bad shape, get it beaded by a pro. Once you've got it prepped, and most of the loose gelcoat removed, barrier coat the hull; it saves soooooo much future work. Ours is on it's 10th year since coating and bottom painting is one of the easiest jobs with a slight sanding then 3 coats of bottom paint every 2 year's. The best, not a blister to be seen.
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