This is the first time I've experienced this. I've painted this stock in the past with success. But when I sanded and hit with primer, the primer is cracking when it dries. Do I have contamination on the areas that it is cracking? It is a B&C Medalist A2. After the last sanding before I tried the first coat of primer, I blew it off with the air nozzle. Then I wiped it down with Witch hazel (didn't have denatured alcohol) to get the dust the nozzle didn't get. Did the witch hazel contaminate the stock?