| Definition |
 |
Small bubbles and pop marks
in the middle coat. |
| |
|
| Cause |
|
Too much paint was applied
(high film thickness). |
|
Middle coat was not allowed
to flash off long enough before low baking. |
|
Spray viscosity was not
correct. |
|
Unsuitable hardener or
reducer was used. |
| |
|
| Prevention |
|
Apply paint at normal film
thickness. |
|
Keep to specified flash-off
times. |
|
Keep to the specifications
on spray viscosity, hardeners and reducers
in the Technical Data. |
| |
|
| Remedy |
|
Allow middle coat to become
fully cured, then sand the affected areas,
clean with silicone remover, isolate any fine
pores with a 2K acrylic surfacer and respray. |
|
Where there is an excessive
number of bubbles/pop marks, sand down the
middle coat completely and apply paint system
again. |
