Paint film contains cracks of random size and degree characteristic of the wrinkles on a reptile’s skin.Also called checking, crazing, wrinkling or splitting.
There are several reasons why the checking, cracking, crazing, wrinkling and splitting of a paint film occur. They are:
- Excessive film thickness: Piling on too much material in full wet coats, either in the topcoat and undercoat material.
- Improper choice in reducer or hardener: It is important to follow a manufacturer’s suggestions on the type of reducers and hardeners to use with each paint. Improper or low quality materials may have an adverse effect on the finished dry paint film.
- Incorrect mixing ratio: If too much activator/hardener is used, or if the correct ratio is not properly mixed, defects may appear in the finished dried paint film.
- Extreme conditions: Excessive heat and/or humidity during and immediately following the application process can cause surface imperfections such as cracking, wrinkling, etc.
- Lifting of substrate: When the wrong reducer is used in a top-coat, or when certain materials are top-coated before achieving full cure, the undercoat may lift in a way that appears like cracking.
- Insufficient surface preparation: Cracking or other imperfections, if present on the substrate or existing finish, should be removed before the new material is applied.
Allow paint film to cure completely, then sand out any imperfections and reapply material having made any necessary adjustments to avoid future cracking, checking, crazing, wrinkling or splitting.