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sandblasting paint and gelcoat
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| Binkie |
Posted on 06/21/08 - 3:53 PM
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http://i176.photobucket.com/albums/w1...G_3540.jpg
This picture is off a recent thread. I just got to thinking if this paint and cracking gel coat could be sandblasted off down the the glass hull, without serious damage to the hull. Once I sandblasted the paint off a concrete swimming pool. I could regulate the air pressure, so I didn`t dig into the concrete or the original marcite stucco finish. It was actually an easy job. I wondered if this would work on a fiberglass hull. I have heard of soda blasting, and I think its expensive. You can rent a sand blaster, and buy a few bags of sand cheap. I may be way off base here, but if I had a hull that looked like that I might give it a try. You would know in 5 minutes or less if it was going to work or not.
Rich
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| kamie |
Posted on 06/21/08 - 4:30 PM
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They were sand blasting paint off before they were soda blasting. The probably is gelcoat is softer than concrete so it's a lot easier to damage the underlying surface. If you don't care about what's underneath from a save it perspective then it's not a bad idea.
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| Binkie |
Posted on 06/21/08 - 5:18 PM
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kamie, you can regulate the air pressure, to only take so much off, so I think it can be done. I sure wouldn`t want to see the foam core. LOL
rich
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| Binkie |
Posted on 06/21/08 - 5:38 PM
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The more I think about it, I think you would leave pit marks in the fiberglass hull, and you would have to skim coat the pitmarks with Bondo, and sand it off, so it might not be a time saver at all. Although they make small portable sand blasters, that are not as agressive, but I never tried one.
http://www.harborfreight.com/cpi/ctaf...mber=92857
rich
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| John Fyke |
Posted on 06/21/08 - 6:04 PM
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Binkie wrote:
The more I think about it, I think you would leave pit marks in the fiberglass hull, and you would have to skim coat the pitmarks with Bondo, and sand it off, so it might not be a time saver at all. Although they make small portable sand blasters, that are not as agressive, but I never tried one.
http://www.harborfreight.com/cpi/ctaf...mber=92857
rich
I've never seen it done but it sure would be nice if it could be. My guess is it would have been done already.
On another note there are industrial coatings available that can fill a 40 grit profile with one pass.
John Fyke
Re-Fit or Reef It
1979 15' Sport with Super Sport conversion and 70hp mercury. |
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| Meridian |
Posted on 06/21/08 - 7:09 PM
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Soda blasting left pinholes in my glass
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| John Fyke |
Posted on 06/21/08 - 7:20 PM
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AtoZ wrote:
Soda blasting left pinholes in my glass
There are pin holes in the glass already.
John Fyke
Re-Fit or Reef It
1979 15' Sport with Super Sport conversion and 70hp mercury. |
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| scrimshaw |
Posted on 06/22/08 - 5:08 AM
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I have had my hull sodablasted $400 2 years ago,the operator told me he could strip it as far as I wanted ! The surface afterwards was pock marked and needed to be washed off before sealing. Went to see a hull that was sandblasted prior to making my decision for sodablasting,imbeded sand,uneven with areas blown right to the glass after seeing the effects of the two techniques it's sodablasting,by the way the sandblast guy wanted 450$. If anyone is in Ct. I have a good guy who will do this in your driveway,provided your neighbors aren't home.
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| arthureld |
Posted on 06/22/08 - 6:53 AM
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Hey Jim, Did you put bottom paint on your boat after you had it stripped?
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| scrimshaw |
Posted on 06/22/08 - 7:17 AM
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Roger,4 coats of Interprotect 2000,lightly sanded and Petitt Vivid Black,smooth as a baby's a.. . I pulled the boat last fall with zero marine growth this is the second season for the bottom paint.
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| arthureld |
Posted on 06/22/08 - 7:26 AM
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My boat looks like it has very thick bottom paint that is about as smooth as sandpaper.
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| kamie |
Posted on 06/22/08 - 7:47 AM
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Rich,
I know that 50# of sand is $3 at most, but you can purchase Baking Soda in 50# bags, if you want to try yourself. It's about $55 per bag and available at any pool supply house.
The results from either are only as good as the operator and the substrate your blasting. If the gelcoat under the paint is in bad shape, even soda blasting will leave pit marks, so will stripping the paint with anything but a sander.
Jim,
Did you have to block the boat? I am actually waiting for the soda blast company I want to use to find a new home so they can block the boat in their shop. If I get impatient I may go the Jeff route in the driveway.
Edited by kamie on 06/22/08 - 7:49 AM |
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| scrimshaw |
Posted on 06/22/08 - 2:03 PM
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Kamie,I fashioned a ramp system and used a come along to a tree to pull the boat and trailer up the ramps to a trailer height of 4 feet off the ground you could easily walk underneath. The boat had been pushed aft on the trailer prior to lifting. Once the crew finished the bottom I cranked on the winch exposing what was missed. I have 3 acres here so it happened right out back ,noisey,dirty best weed control I've ever seen(no growth to date)! The guys that did mine called ahead and asked if my neighbors were home ! This was the first clue,upon arrival they first unloaded the Budweiser,2nd clue,no prep work on their part,no hazmat at all not even masks( I had the topsides covered and duct taped in place soda still got in),3rd clue, the one with the rubberbands on his beard was in charge.....I kept the kids in the house....they appeared to be conversing but it sounded like the flight deck on a carrier I think they were just cursing randomly. The kind of crew you dream of with the price now fully understood($400) ! (I was quoted $2200 at a boat show where I was introduced to an elaborate tenting and recovery system and EPA laws !!). When they completed the job all went quiet,really quiet you wanted to just look around,they invited me to inspect,pointed out areas they felt were thin(they marked them with a wet finger and the dust remained) One guy handed me a stack of business cards,another apologized for cancelling prior appointments as the machine was "stuck in the mud" I gave them a tip and am pleased with the outcome,would not hesitate useing them again.You can't make this stuff up ! Only one of many special events I've enjoyed as an old boat owner. Oh the stories we could tell !
Edited by scrimshaw on 06/22/08 - 2:38 PM |
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| kamie |
Posted on 06/22/08 - 3:42 PM
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The more I think about it, the more I am leaning towards Jeff's gallows frame. It is probably an early spring or late fall job. Don't want to be doing it in 100 degree heat. The trick will be taking a week off of work, and getting lucky on the weather. If not, I should get good at taking it on and off the trailer.
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| SpongeBob |
Posted on 06/22/08 - 4:27 PM
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Binkie I have a 13'er that looks just like the one in the link. In fact some of the nonskid comes off by scraping. I've also thought about sandblasting. Seven or eight years ago I sandblasted a bad paint job off a 15' Gheenoe that my son and I were fixing up for him. The paint came off fairly easily and didn't destroy the gel coat or the glass that was exposed. Mind you the surface looked sandblasted but a coat of olive drab duck boat paint from Cabela's covered it very nicely(very thick paint), so a primer coat and some sanding may do the trick. I'll probably run it to the self serve car wash and see what that pressure will accomplish first. This boat will be a modified Whaler and I'm not looking for an original or Bristol finish. In fact I may use the OD paint again as it's still holding up on the Gheenoe pretty well.
Jeff
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