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Mold Making & Casting Class
Welcome To Concrete
While you could seal it with silicone sealant or similar, I would find an alternative to the hole if want to be water tight.
I'm using a propane weed torch and I find that I have a hard time getting enough air to the flame and it stuffs itself out. I saw the air intake holes in your bruner and I'm curious. What burner do you use?
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