A Guide to Problem Solving - The Application of Interior Wood Coatings Home/Group/English/DOWNLOADS/Problem Solving Guide Fat Edge Ridge of accumulated coating on the edge of the substrate. Cause Preventative Action Coating viscosity too high. Reduce Mirotone coatings as per instructions on the relevant product data sheet to achieve the correct spraying viscosity.  Coating film too high. Apply all Mirotone coatings to the correct Wet Film Thickness as specified on the relevant product data sheet. Incorrect spray coating application techniques. The trigger controls the action of the gun and must be used during each stroke to avoid build up of material at the end of each stroke. The correct procedure is to trigger the gun before reaching the edge of the surface and release it after the end of the substrate has been passed. 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.