A Guide to Problem Solving - The Application of Interior Wood Coatings Home/Group/English/DOWNLOADS/Problem Solving Guide Bubbling Fast drying of the surface of the coating preventing the release of air or solvents from the body of the coating (also called solvent boil or aeration). Cause Preventative Action Excessive airflow in the spray booth. Apply Mirotone coatings in a properly functioning and operational spray booth. Ensure drying rooms have adequate but not excessive ventilation. A maximum airflow of 0.5m³ per second is recommended. Hot or humid atmospheric conditions. Apply coatings during cooler part of of the day. Install temperature and humidity control equipment in the spray booth and drying rooms. Use of fast or incorrect thinners. Use only Mirotone approved MIROSOL Thinners as per the instructions on the relevant product data sheet. Over stirring of coating prior to application. Stir Mirotone coatings thoroughly before use. If aerated leave to stand for 10 to 15 minutes prior to application. Wet Film Build too heavy. Apply all Mirotone coatings as per the Wet Film Build details on the product data sheet. Excessive air pressure being introduced into the coating through incorrect gun settings. Reduce air pressure. Contact your Mirotone representative if problem persists. Inadequate thinning ratio. Thin all Mirotone coatings as per instructions on the relevant product data sheet. Too short a flash-off time before force drying of coating. Contact your Mirotone representative for advice. Heavy or open grain pattern in the substrate. Fill open or end grain substrate with MIROFIL 1702 Grain Filler prior to application of a Mirotone clear coating system. Back to Problem Solving Guide Disclaimer: The recommendations above are based on data from Mirotone’s own research and information from others whose work we believe to be reliable. Due to possible differences in actual application methods and conditions, users must satisfy themselves that the end result meets their requirements.