Originally Posted by Scode68
Kind of sounds good but why is it so hard? Would a slower or faster reducer make it harder sanding?
Not having used that particular primer, I can't answer that about hardness. However, I find it unlikely that it would really be much different from any other 2K filler-primer. Maybe someone else who has used this Dupont primer can chime in and confirm that.
No, type and amount of reducer won't affect the hardness of the primer once cured.
You do need to get the proper sandpaper and sanding board if you don't have that. Get a roll of 3M P400 "Stikit" paper. The board I use is a 3M "Stickit" part#05444. In fact, I have 2 of them. I also keep on hand rolls of P180, P320, and P400 for these boards. This paper is for dry sanding only. IMO, dry is the way to go on primer except for the very final pass.