Potential Finish Problem Sources
Wood
;
- Improper moisture content
- Extreme room temperature
- Extreme color variations in the wood
Assembly
- Glue joints
- Access for sanding and finishing
Hand Sanding
- Proper paper – weight, mineral and grit
- Skipping grits
- Over using paper
- Sanding with too fine of a grit
- Waiting too long between sanding and finishing
- Inadequately maintained tool
- Improper or damaged pad
- Poor sanding technique
- Bearing down too hard on the machine
- Sanding with the edge of the pad
- Sanding too fast
- Inconsistent sanding
- Inadequate air volume to pneumatic tools
Sanding – Wide Belt
- Improper feed speed
- Poor quality belt splices
- Improper roller pressure
- Inadequate dust collection
Compressed Air Systems
- Under-powered compressor
- Poorly maintained compressor
- Plastic pipe used for compressed air system
- Improper piping layout
- Improperly sized piping
- Piping reducers used at inappropriate places
- Undersized air hoses
- Excessively long air hoses
- Inadequate or undersized water and oil filters
- Filters improperly located
Spray Equipment
- Improper needle / nozzle / air cap for material being sprayed
- Gun not adequately maintained
- Improper air and/or fluid settings on gun
- Improper fan size
Staining
- Didn’t make stepped samples
- Applying finish before stain is dry
- Misting on wiping stain on to wood and then not wiping them off
Painting and Clear Coating
- Doesn’t use primer
- Incorrect reduction of finish – especially primers
- Insufficient sanding of primer or sealer
- Does not apply two topcoats of paint or clear coat.
- Not boxing / intermixing all the gallons of paint before spraying to insure consistent color
- Improper use of putty under finish
Spray Technique
- Improper gun technique
- Improper gun to target distance
- Inconsistent gun to target distance – “wind milling”
- Improper gun angle – heel & toe
- Improper or inconsistent gun travel speed
- Doesn’t throttle fluid on/off at beginning and end of each stroke
- Improper spray pattern overlap
- Inside surfaces – spraying technique
- Doesn’t spray towards the booth
- Improper material reduction
- Using wrong solvent for current temperature
- Room / finish / wood too cold
- Improper wet mil application
- Improper number of coats
- Waiting too long between scuff sanding and re-coating
Spray Area
- Housekeeping
- Dirty or missing booth filters
- Overspray build-up on booth and lights
- Un-necessary objects in spray room – dust catchers
- Dust generating operations too close to spray area
- Lack of housekeeping
- Lack of intake air
- Furnace or booth filters used as air intake filters
- Area too cold for finishes
- Improper material storage
- Improper containers for liquid waste
- Improper storage and/or disposal of used rags
- Improper or inadequate lighting
- Not enough drying racks or carts