Should problems occur, a careful and thorough investigation should be made to determine the exact cause of the problem. Every factor that may have a bearing upon the finishing or coating operation from the wood specie through the rubbing and polishing process should be taken into account. To solve problems, consider and analyze the following factors which impact the end result of your finishing operation.

1. Type of surface.
2. Preparation of surface.
3. Type and brand of washcoat or sealer.
4. Type and brand of stain or filler.
5. Type and brand of thinner used.
6. Percentage of material reduction for each coat.
7. Type and brand of topcoats.
8. Method of application.
9. Drying time between coats and method of drying.
10. Number of coats in each operation.
11. Mixing procedures of material prior to application.
12. Appearance of the goods in the package.
13. Shop conditions:
  a. Cleanliness.
  b. Atmospheric conditions.
  c. Knowledge of finishing practice.
14. Coating manufacture dates, product identification numbers.
15. Equipment variables.
16. Expertise of personnel.

An unclean surface, insufficient drying time for each coat, sealing in moisture, failing to stir the material thoroughly, and unfavorable shop conditions are the usual causes of trouble. Also make sure the environmental conditions, ventilation; temperature and humidity are suitable to insure proper application. Check the spray equipment to make sure that the spray gun and compressor are working properly and that neither oil nor moisture is passing through the air or material lines.