I like the automotive primers because they dry quick and you can sand and get a cowling ready in short order. The Lustercoat primer is good, but it takes a day to dry, according to the can. I have not had any troubles with the Lustercoat coming off any cowlings and I have used all different primers. I have not used the Rustoleum, so I can not speak on that brand. Good Luck and I hope that Tammie's has the Primer you are going after. Dave