Reply by Sark

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Posted on Polyurethane Spray too thick and runny. Please help...

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174 posts in 837 days

#1 posted 05-22-2018 09:05 PM

First thought: poor spraying technique. I’ve done a lot of spraying in my cabinet shop using high quality equipment, but I’ve screwed up lots of project with a spray can. A pressured can with finger pressure is tough to control without getting too thick in one area.

Second Thought: Polyurethane not sticking properly to the oiled finished. This would make it run/drip more than if you sprayed on raw wood, especially if you didn’t sand the oiled wood.

Third Thought: A bad can of polyurethane. Actually, I just reread your post, and I’m thinking this is the most likely cause. I have had this happen to me plenty of times. Especially when buying from a local store where the can probably has been sitting on the shelf for a long time. Or where its just a cheap lousy product. The difference between say what HD sells and what professionals use is huge. I use Mohawk for aerosol lacquer and sealer. (Continued on next post)

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