Newbie question about coverage

[ublinkd]

So I coated my first part, a piece of steel deck grating. I have the new 30-50kv gun by the way. It turned out decent. Just a few thinly coated places and I can defiantly see where I can improve. One thing I figured out is that my booth has too much draw, to the point that it is sucking the powder past the part before it can adhere. Anyway my question is this. I am going to try and touch this piece up in the thin spots and underneath where it was sitting on the oven rack. Now I know if I want to get all sides the first time I should hang it but… What do you do to coat the section under the hanging hook or wire (meaning if I want 100% coverage of the part with powder)? If I will always need to go back and touch up that is fine I just want to know before I waste time. Sorry if this is a repeat question but I didn’t know what to search on. Thanks!

[Banditperformance]

You will never get 100% coverage. The part will allways need to rest on, or be hung by somewhere. As well and being a ground point. Now, you can shoot hot, to cover up the ground point. I have had mixed luck with recoating. If you have fully cured the part, then it will have to be coated FULLY again, and not just touched up. The cured powder will not "re-melt" and blend with the second coat. If you are going to be doing stuff you know will have light spots, I usually bake for 2-3 min past flowout, then pull it out. Now, the powder has flowed, but has not been cured, so you can add more in the areas that may need it, then re-flowout the powder, and bake for the full time. That way usually allways comes out nice for me

Now, as far as tricky or large pieces, I have also found it easiest to spray the side that will me mostly unseen first, then fully bake and cool. Then spray/bake the seen side. I do car rims this way. Spray/bake the insides, and let fully cool. That way, the inside powder is cured. Then I spray the outside. But it al depends on the style of rim.

[ublinkd]

Good info! Thanks!

[Scones]

Originally Posted by Banditperformance

You will never get 100% coverage. The part will allways need to rest on, or be hung by somewhere....... The cured powder will not "re-melt" and blend with the second coat.

Just so that I understand this correctly, if I have a part that is impossible to hang, like a completely flat piece of aluminum, I can coat one side, bake it and let it cool, and then go back and coat the other side and bake again? The side that was coated the first time won't be affected by being laid on a oven rack?

[Banditperformance]

NOt always. The rack can imprint itself in the previously done finish when it's heated up to cure temp