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High temperatures concerns during coatings application include: Can cause the solvent to
evaporate too fast, will reduce the pot life, decrease the viscosity of many two-component
materials
High humidity during coating application: Slows the evaporation of the solvent, can leave
moisture on the surface of the coating, may effect the gloss or color, may cause amine blush
(must be removed prior to top coating)
Coatings may be applied by the following methods: Roller, brush, airless spray (including
plural component), conventional spray, high volume low pressure (HVLP), air assisted airless
Coatings Product Data Sheets (Paint Specs) provide users with the following: surface
preparation, storage, mixing and thinning, application procedure, DFT requirements
SDS contains the following: Provides workers and emergency personnel with critical
information on composition, handling or working with the substance. Includes information such
as melting point, boiling point, flash point, toxicity, health effects, first aid, reactivity, storage,
disposal, protective equipment, and spill handling procedures. Provides info regarding the safety
issues associated with any hazardous (or potentially hazardous) material. Provides instructions
for the correct action to take in the event of a spill, explosion, fire or hazardous exposure.
, Failure of coatings to cure may be caused by: not adding curing agent, wrong curing agent
or incorrect amount of it. problem with material from the manufacturer. environmental issues
(too cold, hot, or humid). wrong or contaminated thinner (solvent)
Some of the problems that can be caused by amine blush are: surface tackiness or
greasiness, incomplete curing, poor adhesion, coating discoloration, poor gloss retention
Runs, Sags, and wrinkles may be caused by: applying the coating too thick, too much or
the wrong thinner used, surface too hot to apply the coating, application of coating at the end of
its pot life, wrong thixotrope used in manufacturing
____ is a powdery, friable layer on the surface of a coating that is most common with epoxy
coatings. Chalking
Cratering may be caused by: air trapped in the coating and forming a bubble which then
bursts, air trapped in the coating during mixing if the proper procedures are not followed
Vacules or voids are typically caused by: running the mixer too fast
Pinholes are: Very small holes in a coating typically caused by air or solvent trapped in
porous film and escaping.
A common cause of blistering is: Surface Contamination under the applied coating