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Post by oahupilot on Oct 27, 2011 22:42:16 GMT -5
that mold has a lot of what looks like sharp angles in the photo. Your glass will try bridge over and cause voids in the laminates around the sharp corners. You will either need to use a lot of slurry(filler/resin) or round down those angles more. A good guide line is probably the radius of quarter for 4oz glass and maybe 6oz glass in a wet layup, you could go less in vacuum bag system but thats hard to do without crushing the foam plug.
You might run into some problems removing the pva after you have used solvent to dissolve the foam, their will be residue left over from the solvent/foam that will repel water from dissolving the pva. The other issue will be the wax will also help shield the pva from the water. I would suggest you just split the the tank and clean it out manually then just re bond the tank together with some glass tape. Vinly ester resin will bond over cure resin very well nearly as good as the original bond, so it not an issue to split it.
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hans
Full Member
Posts: 166
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Post by hans on Oct 28, 2011 1:27:11 GMT -5
Hi Oahupilot, thanks a lot for the hints and pointers, much appreciated! That thingy I showed is not the mold, it's merely something I whipped up to take measurements, angles, etc. from. The mold corners will get a 15mm radius (appr. 0.6"R). The top corner will get a similar radius to the outside, which - after curing - will be trimmed down to a width of appr. 1 cm / 0.4". This then will serve as a flange to glue the lid to. I'm not going to use solvent to remove the mold/foam. Rather I'm going to cover the foam in wide packing tape. This will not bind to the resin. Since I'm going to laminate a separate lid (i.e. the split on the top of the tank), I'll have space enough to simply chop up the foam, take out the tape and clean things up. Easy does it. So far my current planning Hans
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Post by o2koold on Oct 28, 2011 19:36:34 GMT -5
Oahupilot, Thanks for the hints. The FRP book I picked up many years ago didn't mention the radius factor, but that make sense. Scott R
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