Caulk for Solar Dryer/Oven

robertz6July 19, 2011

I thought of making a Solar Dryer for my tomatoes. Reading suggests that electricity for store-bought ones runs up the actual cost quickly. In a few hours of reading up on the subject, other uses came to mind.

Making a high quality heating box, it might be possible to put it to three uses. Dryer, cooker, and window furnace in the winter.

One DIY type I saw on TV was a model using sand in soda cans. The maker said his temperature neared 400F.

I read all the labels at the big box store. Looking for a service range of 0-400 degrees F, could not find anything. Most tubes of caulk said nothing, one said it was suitable for -60to 250, and one said up to 150. Even the silicone stuff at $6.50 a tube did not appear to be suitable.

Any suggestions as to which type of caulk or other stuff to use?

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Perhaps the first time I answered my own question. I found just the right caulk at Ace Hardware. Usually prefer the True Value chain, but Ace had a black silicone, service temp -60 to 400F. Really nice labels on their line of caulking products, a square box with the important info inside. Fifty cents cheaper than the GE stuff I saw yesterday at WalMart.

Some important info one can't read because of the tiny print all the various warnings encourage.

    Bookmark   July 19, 2011 at 5:31PM
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Permatex makes a 600'f Rtv. Orange

    Bookmark   July 19, 2011 at 9:38PM
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I'll have to try the Permatex or something else. The black Ace Silicone worked better as a caulk than as a adhesive product. Might be OK on the wood seams, but on holding soda cans together, it didn't work very well.

One solar design used the cans forced together, without any glue or caulk.

    Bookmark   August 13, 2011 at 5:30PM
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