Honestly, winging it can really backfire. I once tried to make salad dressing without a recipe and just guessed on the oil and vinegar. It was so harsh we had to toss the whole bowl. The lettuce wilted from the acid, it was a total loss. Now I at least look at one example online before I start pouring things.

Check how primer blends over both dry and oily areas, @the_sage.

Disagree, sealing just delays the problem. Moisture still gets trapped and warps the boards from underneath.

Remember using the wrong glue on some vinyl trim early on. It stayed put for a week then just peeled off in one gross sheet. I mean, you live and you learn about material compatibility the hard way. Maybe it’s just me but I still double-check every adhesive now.

My friend Tony had a similar issue in his garage last fall. He was chasing an on and off electrical problem and just pressed on the fuse box before breaking out his meters, finding a loose terminal. That simple push saved him hours of diagnostic time.