Adhesion - Intercoat
Problem
Delamination between coats
Whitening of film between coats
Solution
Ensure correct sanding between coats
Allow correct dry time of sealer coats
Use correct finishing system
Ensure no contamination on previous coat
Apply a wet coat material
Do not fog or mist coating to apply thinner film builds
Adhesion - Stain
Problem
Delamination to stain
Whitening of film between coats
Solution
Reduce application of stain
Ensure sufficient wiping of stain
Allow correct dry time of stain
Dark stains should be obtained by using toners before stain application
Avoid heavy shading
Make sure to use the correct finishing system (sealer/topcoat) to match stain
Apply wet coat of sealer or topcoat
Do not fog or mist coating to apply thinner film builds
Adhesion - Substrate
Problem
Removal of film to substrate
Delamination to substrate when impacted
Solution
Ensure correct sanding of substrate
Use correct finishing system to match topcoat with primer used
Ensure no contamination on substrate
Apply wet coat of material
Do not fog or mist coating to apply thinner film builds
Closed grain hardwoods should be well sanded before use
Higher solids finishes need a better wood profile to anchor to than low solids
Ensure sand paper is not worn
Air Entrapment
Problem
Bubbles from pores in the wood
Air entrapment from preparation of paint
Air entrapment from application
Blistering from drying techniques
Topcoat attacking previous coat
Solution
Use defoamer
Use slower solvent balance
Change airflow during drying, check for drafts
Reduce air pressure during application
Spray thin wash coat as first coat
Ensure adequate flash off before oven
Reduce viscosity
Bring lacquer to room temperature
Use correct thinner
Use weakest solvent for previous coat to avoid blistering
Reduce recirculation speed
Reduce film thickness
Bénard Cells
Problem
Cell pattern in finish
Color and surface irregularities
Solution
Add dispersant
Add silicone additive to reduce surface tension
Increase application viscosity
Lower application thickness
Add thixotrope or thickener
Bleeding
Problem
Color migration from coated substrate
Color in sanding dust
Colored film on surface
Solution
Avoid bleeding dyes and pigments
Use vinyl sealer to seal color
Change from acid catalyzed material
Blocking
Problem
Sticking together of panels when dry
Solution
Reduce film build applied
Increase or ensure recommended dry times are followed
Ensure ovens are at the correct temperature
Increase or ensure correct airflow during dry
Ensure correct temperature of substrate
Decrease or ensure correct temperatures at stacking
Blooming
Problem
Hazy deposit on film
Oily or wax-like substance on surface
Reduced gloss
Mottled or non-uniform surface
Solution
Adjust catalyst level – over–catalyzation
Do not use stearated materials such as lacquers and certain polyesters under acid catalyzed coatings
Check formula for incompatibility
Check substrate for contamination
Blushing
Problem
Whitening of surface
Lowering of gloss
Solution
Reduce humidity
Use richer thinner
Check water level in equipment
Warm lacquer to room temperature
Increase temperature of application area
Slow dry time
Dry waterborne stains or sealers
Brittleness
Problem
Poor coin scratch
Delamination of film when impacted
Solution
Ensure that brittleness is not lack of adhesion
Check with representative
If a catalyzed system, check ratio
Brown Spots
Problem
Brown spots in film
Solution
Clean air lines of oil contamination
Drain or repair oil separator
Bumps and Sinks
Problem
Uneven surface appearance
Low depth of image (D.O.I.)
Solution
Add silicone flow additive
Add thixotrope
- How-To Videos
- Why:Waterborne Coatings
- How:Waterborne Coatings
- C-Mix Wipe Stains
- Vivid Spray Stains
- ora verde Two-Part Polyurethanes
- Variseal & Varicure System
- Variset Primer/TC System
- White Wood Sanding
- Catalyzation
- Viscosity
- Agitation
- Basic Spray Techniques
- Intercoat Sanding
- Preventing Common Finishing Problems