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Bondo: Does it hold water?

V

Vertigo Acid

2(-log[H+])4u
Joined
May 31, 2003
Messages
12,410
Ok, i'm going to be starting off a resivoir project this weekend, and i've got a few concerns. I've got a 4 liter erylamier flask that i'm going to do fiberglassing and bondo around to make a nuclear reactor cooling tower shape. But, the flask has a *slight* crack in the bottom, and so I don't really know how well it will take to having a couple of holes drilled into it and 3.5 liters of water pressure above it. I'm going to a glass repair place to see if they can fix the crack and drill the holes for me. But, if that doesn't work, i'm going to go with just a fiberglass enclouse. The shape I am going for is such that whole pieces of fiberglass cloth aren't going to be as effective as a fiberglass tape. So, correct me if i'm wrong, but it won't be watertight by itself. All of it is going to be covered in bondo tho, hence the question.
 
Don't they make boats out of fiberglass. I would use aquarium silcone sealant 1st to seal the crack then I think you should be ok.
 
I work with bondo at an antique car restoration shop, and I really doubt that it will hold water. Bondo is not ment for that purpose, and I would try using the fiberglass to fix the crack.

Just dont count on the bondo to work. Over time it might get weaker and weaker, and finally crack.
 
Bondo is porous. it may not leak directly, but over time water penetrating it will severely weaken it.
 
bondo can actually retain water in it and start to rot out over time. thats why its not a good idea to put bondo on a car unless you plan on primering it right away, or you rish having that area rust out even worse within a year or so.
 
huh, i didnt know that... Maybe if u sealed it with some goop (plumers goop is the best shit in the world for sealent) then use bondo to make it look nice
 
Originally posted by phasmatis_nox
Use some silicone sealer to get everything watertight first, then go for the bondo.
Click to expand...

I would too.
 
fiberglass works good for sealing against leakage. I had a small hole in a metal gas tank on my motorcycle many years ago and I poured some fiberglass in it, let it coat the bottom and never had any more leak promblems. Had that bike probably another 5 yrs or so after that.
 
Well, the flask was really just an oppertunity item, and yeah for that size they are ~$20-30, plus tons of shipping costs. Anyway, talked to a glass repair place, and they can't fix the crack so it will hold that much water, so i'm ditching the flask and going to make a resevoir purely out of fiberglass, same design as before. The bondo doesn't really need to hold much water, now that I think about it, because the fiberglass is going to be on the inside, and if I do enough layers with the tape there will be enough overlap to keep it water tight. Will post a worklog once my materials come it :D
 
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