First, I am a newbie to painting. I recently purchased all the gear and such from Len, and did a first project. I painted a damaged bumper on 2000 Mustang. For the most part the painting part went well, after playing / learning about the new tools and such. I used PPG Omni AU basecoat (Black) with Omni Clear Coat. I know you should use family of products, but used Duplicolor plastic adhesion primer under the basecoat.

After finishing the Clear Coat in the initial drying period, I noticed a brown tint in the repaired area. It appears to be under the Clear Coat and limited to the basic repair area, not in blended area. Several days have passed, and the brown tint is fading somewhat but still visible.

I have not done any sanding, compounding, etc, at this point.

What might be the reason for the color change, using a non-family product like Duplicolor with the PPG product? Thanks