Quote:
Originally Posted by black94t
If I do put 2 coats down, is it mandatory I sand it down? I'm assuming sanding it will put some texture on the powder to give adhesion to the powder? I never thought of that (though this is not related to my thread topic).
I will definitely try the way you described. It's real close to what I'm doing, but this may be a matter of tweaking the process a little to get it right. I also just switched to aluminum oxide 70g to blast parts and I just did some wheel centers and I have to remark that they look better than glass beads. And in less time. I think there is a combination of things, but I'm going to focus on ensuring no water or vapors are in my air lines and to ensure there are no foreign particles on the substrate.
As always, thanks for your input. I get excited when I see "harley dad" posting replies   |
Thanks for the kind words guy's.
JTW could be correct that it may be the powder, although you stated you had the same trouble with EW Mirror black.
As far as sanding for a second coat, you are correct, aid in adhesion is why it's done. Now, there are certain scenarios when to sand and when not to. Thats a whole other topic.
The theory is glass beads will embed themselves in the aluminum, switching to AO should help.
I've been following the Eastwod post also. Some good tips there as well. This thread is specifically about the aluminum valve covers. I should have asked, do you have these problems with everything or just this particular job? Contaminated air could also be the culprit. Take your air line and shoot it at a clean white piece of paper for a couple minutes, see if anything shows up.