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Jon and V Boat Conversions & Modifications
Another Jet Ski John Boat (New pics and video 01-18-2012)
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<blockquote data-quote="PSG-1" data-source="post: 232521" data-attributes="member: 6937"><p>That step between the boat hull and the pump is definitely enough to cause an air pocket, and some cavitation to go along with it.</p><p></p><p>Bondo-glass is a drastic step above regular Bondo, for sure. Because it has the 'hair' in it, that makes it more rigid, less susceptible to cracking like regular bondo. I think it's definitely worth a try, at least. If you can fill that void, I think you'll eliminate a good bit of your cavitation. </p><p></p><p></p><p>My girlfriend's brother used Bondo-glass on the bottom of his aluminum boat, where he had some leaks from corrosion, and being pulled up on oyster beds. So far, so good. I've always heard that you can't put fiberglass on the bottom of an aluminum boat, and that's probably true, to some extent, like if you try to do it with a sheet of cloth, that will most certainly de-laminate. But chopped glass is a different story, especially in small areas. </p><p></p><p>You definitely want to prep the area as much as possible, sand it with some coarse paper to give it a good surface to bond to, and wipe it down with MEK or acetone right before you do the glass work, to remove any dust, grease, or grime. </p><p></p><p></p><p></p><p></p><p>On that note, I just discovered this morning that my 16 foot Triton has some issues with electrolysis, the first 3 feet of the center strake has some deep pitting, despite having zincs on the boat, and a coat of bottom paint. (I guess when you leave a boat in saltwater for 300+ days out of the year, there's really nothing that will stop electrolysis) </p><p></p><p> I thought about doing the Bondo-glass to repair it, but someone told me there's a ceramic coating that can be applied, which is even stronger than Bondo-glass, so, I'm going to try that.</p><p></p><p></p><p>Anyhow, keep us posted on the progress with your boat. Project boats like this are always a matter of trial and error, and testing and improving existing designs. It takes a little time to get bugs worked out. Stick with it, though, don't give up!</p></blockquote><p></p>
[QUOTE="PSG-1, post: 232521, member: 6937"] That step between the boat hull and the pump is definitely enough to cause an air pocket, and some cavitation to go along with it. Bondo-glass is a drastic step above regular Bondo, for sure. Because it has the 'hair' in it, that makes it more rigid, less susceptible to cracking like regular bondo. I think it's definitely worth a try, at least. If you can fill that void, I think you'll eliminate a good bit of your cavitation. My girlfriend's brother used Bondo-glass on the bottom of his aluminum boat, where he had some leaks from corrosion, and being pulled up on oyster beds. So far, so good. I've always heard that you can't put fiberglass on the bottom of an aluminum boat, and that's probably true, to some extent, like if you try to do it with a sheet of cloth, that will most certainly de-laminate. But chopped glass is a different story, especially in small areas. You definitely want to prep the area as much as possible, sand it with some coarse paper to give it a good surface to bond to, and wipe it down with MEK or acetone right before you do the glass work, to remove any dust, grease, or grime. On that note, I just discovered this morning that my 16 foot Triton has some issues with electrolysis, the first 3 feet of the center strake has some deep pitting, despite having zincs on the boat, and a coat of bottom paint. (I guess when you leave a boat in saltwater for 300+ days out of the year, there's really nothing that will stop electrolysis) I thought about doing the Bondo-glass to repair it, but someone told me there's a ceramic coating that can be applied, which is even stronger than Bondo-glass, so, I'm going to try that. Anyhow, keep us posted on the progress with your boat. Project boats like this are always a matter of trial and error, and testing and improving existing designs. It takes a little time to get bugs worked out. Stick with it, though, don't give up! [/QUOTE]
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Jon and V Boat Conversions & Modifications
Another Jet Ski John Boat (New pics and video 01-18-2012)
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