Martyn
Supporting Sponsor, Overland Certified OC0018
the dude said:I just wanted to share my experiences with powder coatings. I'll start off by saying that I sell and service industrial coatings (which includes powder) for PPG and have been doing so for 15 years.
In my experince the first question you want to ask is what are they doing for pretreatment. Does it include blasting, wash or a combination of both. What are they blasting with? In their wash are they degreasing, phosphating and sealing? This will have a lot to do with costing and the performance of the coatings.
As for the thickness of the coating. You can have too much paint, be it liquid or powder. It may become brittle and be susceptible to greater rock chipping. Paint can also crack if used as filler. Ask if they have a high heat caulking that they apply before powder coating to fill any seams.
Make sure you ask about those items that Martyn pointed out,
even and full coverage
no sags/runs
no cross contamination
if you really want to go high end look into a zinc rich epoxy primer under you top coat color.
Great information, thanks for sharing.
I should add that on our seams we use an automotive silicone adhesive to fill the gaps. Our panels are also phosphate washed.
The Dude's explanation shows that the quality of the finish has so much to do with the preparation work.