Gel Question |
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eric lavine
Grand Poobah Joined: August-13-2006 Location: United States Status: Offline Points: 13413 |
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Posted: May-09-2009 at 11:13am |
Black friday, i removed a stripe yesterday and of coarse it was raised, I hogged the stripe and surrounding areas with 320 dry...and was getting ready to go down to 180, did the rest of the side with 320. went t0 600 dry, then to a tr lax or something like that pad wet. thats was 2000.
then glid over it with compound.....red boat, mirror finish. at first i was delicate but once i got the feel i started hogging. all with a orbital. I rather have my finger nails pulled then to do that again...I must have A.D.D cause i had to walk away every 10 minutes |
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"the things you own will start to own you"
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21184 |
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First of all, I thought a DA was a sander, sounds like youre referring to a random orbital polisher. I strongly disagree with you 800 grit cutoff. If youve got a lot of gel to go through to restore the color, then youll make much faster progress going with 320-400-600-800 than if you were to sit there and sand with 800 until you get the results you want. Trust me, Ive run into this scenario several times. Sanding sucks! |
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duffnit
Senior Member Joined: October-12-2005 Location: United States Status: Offline Points: 235 |
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Wow Lewy that looks great!
I don't think mine will clean up that nice but it sure gives me some incentive! From your avatar pics it looks like your white was brighter than mine from the start. Nice work. Looks good. ' Thanks for your input. It helps to look at the same set up. Danny |
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Danny
"no offense- but the rate at which you spread bad information is very impressive" |
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79nautique
Grand Poobah Joined: January-27-2004 Location: United States Status: Offline Points: 7872 |
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Well my .02 is if rubbing compound and a DA doesn't get the shine back then wet sanding will and since your really only going to get a shine out of it and not color, then it's pretty much a waist of time to be aggresive and use coarse paper that you have to sand the the marks back out. So to my using anything less than the 800 is only making your boat thinner and gains you nothing but waisted timing smoothing out something you roughed up.
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lewy2001
Grand Poobah Joined: March-19-2008 Location: NSW Australia Status: Offline Points: 2234 |
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Danny it is after wet sanding. Like Pete said I sanded these area's with 400 grit a lot more than any where else on the boat without much change. It makes sense that it is in ground dirt. Most of the fading was on the Mulberry strip. I did try the acid cleaners and cutting compounds first. All I acheived was getting a good shine on the faded gel. I only used 600 everywhere else on the boat followed by 800,1000,1200-1500 then cutting compound with DA. It was worth the effort but I don't think I would take it up as a full time job. |
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If you're going through hell, keep going
89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
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duffnit
Senior Member Joined: October-12-2005 Location: United States Status: Offline Points: 235 |
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Pete writes:
"I was down to 320 and would have to say I probably removed 2/3'rd's of the gel. Still no change - the virgin color was still very visable." Wow Pete, thats pretty aggressive. I have no desire to re-gel the boat. She has a few battle scares where I need to do some nick repairs but I didn't buy a trailer queen and have no desire to make her into one. I guess it is what it is. If I can brighten her up some, repair some misc nicks and replace the rubrail I'll be content. Thanks for the input. Much to contemplate. Danny |
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Danny
"no offense- but the rate at which you spread bad information is very impressive" |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Yes, I did as well as one of the acid hull cleaners and Interlux fiberglass gel stain remover. They didn't work!!! The discoloration in in the gel from the years of UV as well as dirt down in the pores. Gel is porous! On my transom job, I was down to 320 and would have to say I probably removed 2/3'rd's of the gel. Still no change - the virgin color was still very visable. |
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duffnit
Senior Member Joined: October-12-2005 Location: United States Status: Offline Points: 235 |
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Thanks Lewy and Pete.
Lewy, is that picture before or after you wetsanded? The PO at some point re-vinyled the bow and stern. He cut out the vinyl on the boat and in doing so left grooves in the gel. I know wetsanding is inevitable but how aggressive remains unseen. I just want to get an overall understanding of what has worked for others before I jump in. Did either one of you try the muratic acid trick others have used? I thought I might try that and see if it would help the dingy color. Lots to learn. Danny |
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Danny
"no offense- but the rate at which you spread bad information is very impressive" |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Danny,
Getting the virgin color back to match areas under vinyl is a tough one. I didn't have any luck on my 77 and Lewy above is another example. I ended one have to get decals made (the since 1925) because the ones available where smaller. The transom because the PO had named the boat I had to completely re gel. Your best bet would be to match the original vinyl and cover it back up!! The "weave" you see through the gel is common. It's very visable in the 70's boats and even worse on the 60's hulls. CC used a roving for the first layer of glass next to the gel and this "telescopes" through. It's not from improper wet sanding. |
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lewy2001
Grand Poobah Joined: March-19-2008 Location: NSW Australia Status: Offline Points: 2234 |
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duffnit You have the same colour combination as my 89. You also have the same colour difference I had when I removed the vinyl highlights on the bow & stern decks. I wet sanded these areas very aggressively with 400 grit and still could not get the fading back to the same virgin white. TRBenj was able to get it back on his 90 model but I was not game to sand much more on the deck areas. The problem is easily solved though as you can used the colour difference to make a template for new vinyl. You are right it is more discoloured than faded/oxidised. |
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If you're going through hell, keep going
89 Ski <a href="http://www.correctcraftfan.com/diaries/details.asp?ID=5685" ta |
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duffnit
Senior Member Joined: October-12-2005 Location: United States Status: Offline Points: 235 |
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Thanks Sanity n 79 for the input.
I don't know if my issues would be considered fading. If I hadn't removed the bow vinyl then it wouldn't be as obvious how dark the white has become. The 89 (from what I found) had two standard Gel coat colors (deck/hull) white and light grey with several accent colors. Mine (I assume) was white & cranberry but now fares more to an off white & cranberry. Knowing mine has had previous gel work (obvious from the blended areas) I wanted to take a cautious approach to the wetsanding method. As a further note, my cousin has the same basic color scheme on his 86. When we looked at his I noticed along the top of the gunnels you can detect the weave of the fiberglass in the right light. I suppose that is what prompted my thoughts on the prior wetsanding question. I may try the da route. Whatever method I just don't want to create any more problems. Thanks for the ideas. Danny |
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Danny
"no offense- but the rate at which you spread bad information is very impressive" |
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79nautique
Grand Poobah Joined: January-27-2004 Location: United States Status: Offline Points: 7872 |
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it should be thick enough and not an issue to wet sand again, unless your going to use a course grit and sand it off before you get to the finer grits. I started with a much finer grit than most start with on a DA and it takes no time and removes very little gel, but I used 800 then followed with 1500 when I redid the transom before I added new decals.
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sanity
Gold Member Joined: September-16-2008 Location: United States Status: Offline Points: 799 |
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Danny,
They have a guage that you can use to measure the thickness of the gel. I don't know the standards or if there are any for the original application. Are you fading? |
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duffnit
Senior Member Joined: October-12-2005 Location: United States Status: Offline Points: 235 |
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All the post I've read cover all but one thing. How can you determine if the gel has been wetsanded in a previous life?
I'm planning on wetsanding mine at some point. I do know that some gel work has been done by PO (barefoot boom damage) but I'm still trying to determine to what degree. Any suggestions/ideas are welcomed. Thanks, Danny |
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Danny
"no offense- but the rate at which you spread bad information is very impressive" |
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