I’m not sure about the weather in your part of the world, but where I am and around much of the United States temperatures are cold. It’s been 13 days since I last saw temps above freezing. When I’m not in the shop, I keep the thermostat set around 40° F. It’s not low enough to freeze water, but it does turn my PVA glue somewhat reptile-like. To get the sticky stuff better flowing, I needed to warm things up, but I didn’t need hot glue.
Your first thought may be to hold the bottle under a faucet of running hot water. Sure that would work, but why waste water? My answer to heating my glue was to toss it into my microwave oven for a time or two.
If you bottle is full, pop the top to allow for expansion. (No, I didn’t learn that the hard way.) My bottle had room inside, so I laid it down and turn on the nukes. After 10 seconds, I flipped the bottle and ran it another 10. Bingo.
It surprised me how warm my glue became, and how easy it was to shake in the bottle. Back in the shop it worked great. Easy to squeeze.
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