I hear ya. Just scuff, use an adhesion promoter and put on 3-4 good solid coats. It will even out. Use adhesion promoter (wait 10-15 mins) this will depend on how hot it is too. Basically let the promoter dry a bit, but not all the way. Do a light coat on your first pass and then go gradually heavier. Dont just go after it, it will run. If you get a run just tap the run to even it out ( dont smear the run). Your next coat will cover up the run as long as it wasnt huge. I had a couple, but you cant tell.
Paratroopers stay up longer!