TROUBLE SHOOTING Finishing Problems

ORANGEPEEL:

Surface looks like the peel of an orange or a miniature topographic map.

Cause:

• The film does not level out completely because the lacquer dries before it can flow together.

Corrections:

• Use a matched and proper thinner for your lacquer.

• Thin no more than 25% unless specified by the manufacturer.

• Spray at 8 - 12 inches from the surface.

• Use as little air pressure as will allow a proper coat of material to be applied.

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OVERSPRAY:

Roughness or sometimes white looking fuzz stuck in the finish surface.

Cause:

• Too much air pressure or bounce-back from spraying too close to the surface; or spraying into blind corners.

• Excessive air flow pre-dries the atomized lacquer before it can reach the surface.

Corrections:

• Spray at 8 -12 inches from surface.

• Use as little air pressure as will allow a proper coat of material to be applied.

• Spray in an environment free from excessive air flow.

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SAGGING, & RUNS:

Runs and drips of lacquer that collect by gravity in thick ridges.

Causes:

• Over thinning;

• Cold surface and material

• Too much material applied per coat or coats applied in rapid succession;

• Worn or damaged spray gun cap, nozzle, and/or needle.

Corrections:

• Remedy any or all of the conditions above.

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POOR ADHESION:

Coat flakes off with fingernail and edges or corners chip off easily with minor impact, or bumps. --- Finish lacks durability and rubs, chips, or flakes off easily.

Causes:

• Dry spray; from too much air flow over work piece as in too much fan speed in a booth

• Dusty surface or other surface contamination, poorly cleaned just prior to spraying.

• Too much atomization air or too little material leaving the gun.

• Spray gun too far away from surface.

Corrections:

• Remedy any or all of the conditions above.

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PIN HOLES:

Tiny holes that look like somebody took a pin and put holes in the film of lacquer.

Cause:

• Moisture in the lacquer when being sprayed.

Corrections:

• Bleed air lines and compressor tank completely on a daily basis.

• Install a moisture filter as close to the spray gun as possible.

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BLISTERS:

A raised bubble on surface of lacquer.

Cause:

• Too heavy of a film build-up of lacquer at one time.

Corrections:

• Cut back fluid and air pressure.

• Thin lacquer (not more than 25% unless specifically recommended by the manufacturer).

• Spray lighter coats.