Worst Gel-Coat Job ever - Page 2 - SailNet Community
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post #11 of 21 Old 04-04-2013
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Re: Worst Gel-Coat Job ever

Hi David,
Our neighbor was having some men work on his gel coat, but they only showed up one time to do part of the job, and then they never returned. He took it into his own hands and found a much easier and cheaper way to do it. This is in case you have a big job to do later on. He used a sprayer called "Preval" and bought the gel coat in the cans with mixer, hardener, tinting (if required) and premixed it all together before attaching it to the bottom of the Preval sprayer (nothing more than a type of aerosal can). You spray it on evenly, several coats...you'll need to follow the directions on the gel coat. You can look this up online, under "Preval" and they have videos to show you how to do it. Our neighbor's boat is looking fine...he sanded part of it with very fine sand paper and it came out beautifully. I'd send pics, but it's all taped up. It's not for everyone, but thought I'd mention it since it turned out so well on his boat, and it cost him 1/8th the price that the guys were going to charge him. Of course, he had to do the work. You might be interested in checking this out online.
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years from now you will be more disappointed by the things that you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover.
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post #12 of 21 Old 04-04-2013
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Re: Worst Gel-Coat Job ever

Well

If you think gelcoat is a bitch to wetsand which it is, watch fully cured Awlgrip destroy even the best 400 grit wet sandpaper

When I had to wetsand a 6" wide X 65' long section of Seafevers Tan Awlgrip to prepare it for the green Awlgrip strip I went through several packages

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post #13 of 21 Old 04-04-2013 Thread Starter
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Re: Worst Gel-Coat Job ever

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Originally Posted by dsullyec1 View Post
Hi David,
Our neighbor was having some men work on his gel coat, but they only showed up one time to do part of the job, and then they never returned. He took it into his own hands and found a much easier and cheaper way to do it. This is in case you have a big job to do later on. He used a sprayer called "Preval" and bought the gel coat in the cans with mixer, hardener, tinting (if required) and premixed it all together before attaching it to the bottom of the Preval sprayer (nothing more than a type of aerosal can). You spray it on evenly, several coats...you'll need to follow the directions on the gel coat. You can look this up online, under "Preval" and they have videos to show you how to do it. Our neighbor's boat is looking fine...he sanded part of it with very fine sand paper and it came out beautifully. I'd send pics, but it's all taped up. It's not for everyone, but thought I'd mention it since it turned out so well on his boat, and it cost him 1/8th the price that the guys were going to charge him. Of course, he had to do the work. You might be interested in checking this out online.
Did he do the whole boat or just a section?
How big?

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It is a lesson about the limitations of wax as an adhesive.
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post #14 of 21 Old 04-04-2013 Thread Starter
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Re: Worst Gel-Coat Job ever

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Davidpm...why was it hard to sand? Hardness or sticky or what?
hard

At first I didn't use water.
Water makes it possible but it is still very hard stuff.

The lesson from the Icarus story is not about human failing.
It is a lesson about the limitations of wax as an adhesive.
If you have an engineering problem solve it.
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post #15 of 21 Old 04-04-2013
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Re: Worst Gel-Coat Job ever

Dsully, how many cans of spray did he use, and over what size area?

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post #16 of 21 Old 04-05-2013
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Re: Worst Gel-Coat Job ever

He did an area of approx. 18" tall by 15' wide and on both sides of the boat...5 ports per side, so take that space out of the equation, and he used about 10 cans of preval aerosal. Cans were about $6.00 apiece.
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years from now you will be more disappointed by the things that you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover.
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post #17 of 21 Old 04-05-2013
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Re: Worst Gel-Coat Job ever

In my limited experience with Gelcoat I have learned a couple of things;
  • it DOES NOT change color or hue as it dries. I am sure that you have seen paint change hue (slightly) as it dries.
  • it does not dry (cure) without hardener
  • with the two above points in mind, I have used a container of clear plastic to take my time and combine gelcoat & tint to try to match color as well as my eye can see. I add hardener just before I apply.
  • it smells AWFUL
  • it likes to adhere to a "flat" surface. Thus, it is not good for filling cracks, and you need to feather the surface to get gelcoat to stick. The recommended practice is to open hairline cracks with a screwdriver or can opener in order to provide a wider surface for the gel to stick to.
  • it has a reputation for cracking if applied too thickly. However, I have mixed it with Cabosil/microfibers to fill and fair some deep voids, and it seems to be working fine.

YMMV


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post #18 of 21 Old 04-05-2013
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Re: Worst Gel-Coat Job ever

I forgot to mention that our neighbor did use something as a hardener, but I'm not sure what it is. He sprayed it on...purple stuff. Don't know the name of it. I'll ask when he comes this weekend.

Diane


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years from now you will be more disappointed by the things that you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover.
Mark Twain
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post #19 of 21 Old 04-05-2013
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Re: Worst Gel-Coat Job ever

the purple stuff was PVA it is used to keep the air off of the surface so the surface will harden. Aquanet hair spray will also work. it is just PVA with a scent. Pledge spray wax also works just harder to clean off. Gelcoat is made to remain tacky on the surface so when it is sprayed into a mold the next layer of Glass/resin will stick to it, so when not used in a mold you need to keep the air off so it will cure

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post #20 of 21 Old 04-07-2013 Thread Starter
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Re: Worst Gel-Coat Job ever

I used this gel-coat.
WEST MARINE Waxed, Non-Laminating, Finish Gel Coat at West Marine

On the web it says it is waxed but I could not find the word wax on the can any place.
It took over 24 maybe 48 hours to dry in my cool basement.

The lesson from the Icarus story is not about human failing.
It is a lesson about the limitations of wax as an adhesive.
If you have an engineering problem solve it.
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