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Why is a new coat of polyurethane tacky?

I have an interior door that had stain and polyurethane on it from 10 years ago. I didn't sand it down i just applied a new coat of polyurethane and now I have tacky places that won't dry. How to I ...
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Can poly plastic water storage tank be used to store hot water?

Another set of questions in context of my home-brew solar water heater: Can poly-plastic water storage tanks, be used to store hot water (140deg F / 60deg C) ? How can I thermally insulate a 50 ...
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Why won't stain go on evenly on my oak floors?

I sanded and stained new oak floors. Several areas look blotchy like it was sponged on, which is was not. Other areas won't take the stain and are much lighter. These areas did not show up until after ...
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Will Polyurethane bond to a surface that was sanded with 320 grit?

I have some MDF that was sanded with a random orbital sander with 320grit Will polyurethane make a decent bond to this?