I've not found that it matters. I don't find that they leak, if stood tip up, layed flat, or even left in the gun... at least not for something like window glaze, painter's putty, or other latex calk.
I do have problems with silicone though. That stuff seems to even leak out of the tube even if it's not opened. I've found the best thing is to buy only what you need, use it quickly, and then discard whats left.
CWS
I do have problems with silicone though. That stuff seems to even leak out of the tube even if it's not opened. I've found the best thing is to buy only what you need, use it quickly, and then discard whats left.
CWS

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