Yellowing of the surface corresponding to areas of filler in the substrate.
Cause
Excess quantities of peroxide used in the filler.
Prevention
Accurately mix body filler/putty/stopper by weight. Alternatively, use a PPG recommend dispenser.
Mix the compounds thoroughly with and Spreader and Mixing Board to achieve a homogeneous mix.
Rectification
Remove the affected material and repeat the filler repair process.
