I finally got done sanding all the slick sand. I did find a lot of low and high areas which I have fixed already. My question is, can I use 1k primer as a last primer coat. The reason I am asking is, I have about 3/4 of a gallon and I figured it would save me some money that I can spend elsewhere. Will the 1k build high enough for me to black back off, or should I spend the money and get the 2k. Thanks guys and gals.