08-21-2020, 08:14 PM
White spots are due to a small part of resin that do not polymerize in a continuous film but leaves a surface with holes and gaps where air appears that change the refractive index of the surface.
This is why these spots appear white but if you wet them with a solvent they temporarly disappear.
The main reason is the presence of water or cleaning solvent with water inside as Alcool not 99,9% water remains trapped and leads to impefections in the film of the polymer surface.
A solvent with a very rapid evaporation rate tends to enhance the phenomenon even without water or humidity presents.
This is why these spots appear white but if you wet them with a solvent they temporarly disappear.
The main reason is the presence of water or cleaning solvent with water inside as Alcool not 99,9% water remains trapped and leads to impefections in the film of the polymer surface.
A solvent with a very rapid evaporation rate tends to enhance the phenomenon even without water or humidity presents.