CRACKING OR RIPPLING
Description of problem:
Cracks show in one of the ground coats.
– Difference in solubility between paint films due to the aging and hardening of the surface.
– A ground coat which has been force-dried at elevated temperatures before polishing and
application of the final coat.
– Sandwiching a synthetic product such as synthetic primers between 2 coats of
– Excessive delay before applying the second coat of a synthetic paint
(the 1st coat has begun to dry).
– Using an “incorrect” isolating primer instead of removing the old paint.
– Strong solvents in the top coat attacking a synthetic primer that has been applied very
thick with minimal or no flash off times between coats.
– The application of thick wet coats of synthetic paint increases the chances of cracking.
– The difference in flexibility between 2 types of finishes whereby the 1st coat is more
flexible than the 2nd one usually leads to cracking.
– Sand the original paint very well before painting (in some cases isolate or remove old paint).
– Make sure that the temperature of the surface to be painted is the same as the
– Avoid thick coats.
– Never sandwich a synthetic product between 2 NC coats.
– Perform solvent test.
– Ensure sufficient drying.
It is wise to make a test on a small surface before painting. If cracking occurs, it is best to
apply GenPox isolating primer over the entire surface.
– In extreme cases, sand all the way through to the bare metal, clean with Valox and respray.
– In minor cases, especially with T.P.A (Thermoplastic Acrylics) you may sand with
P1200 and polish.
- TEMATY SZKOLEŃ
- Drying is too slow
- BULLES SOUFFLURES
- Stripping / Banding
- Fish eyes
- Spider’s web
- ATMOSPHERIC POLLUTION
- CRACKING OR RIPPLING
- Loss of gloss
- Low gloss
- ADHESION PROBLEMS OF THE CLEAR COAT
- Orange peel
- Pin holing
- Poor adhesion
- SHRINKAGE / EDGE MAPPING
- Poor opacity
- Color offshade
- SOLVENT POPPING
- Polish marks
- Sanding marks