Water Spotting
I am an automotive paint formulator in the Middle East. Two weeks ago, our weather was rainy and we saw water spot defects on the horizontal surfaces of test specimens on our outdoor exposure racks. This was after the top coat curing step. We believed them to be fully cured.
We’ve studied this problem quite a bit but have not yet found a cause.
#automotive
Q. I am an automotive paint formulator in the Middle East. Two weeks ago, our weather was rainy and we saw water spot defects on the horizontal surfaces of test specimens on our outdoor exposure racks. This was after the top coat curing step. We believed them to be fully cured.
We’ve studied this problem quite a bit but have not yet found a cause. Please help me solve this problem. M.A.
A. As you are aware, fully cured automotive topcoats should not water spot after a rain event. Therefore the solution to your problem is simple. Either your top coat formulation is not automotive grade, or it was not fully cured when exposed.
RELATED CONTENT
-
Zinc Phosphate: Questions and Answers
Our experts share specific questions about zinc phosphate and pretreatment
-
Curing Oven Basics
Simply heating up the substrate does not cure the coating. There are many variables to consider when choosing the best cure oven for your application...
-
A Current Affair: Examining the "No Amperage" Phenomenon
If you are performing a coating process that requires the use of a rectifier, you may have experienced the "no amperage" problem. Here's a look at the phenomenon and some solutions…