Cause: Let the pickle dry longer. or spraying into blind corners and cubby holes, as in bookshelves or desks. ORANGEPEEL: * To much air pressure to pump and air assist can cause tiny bubbles Roughness or sometimes white looking fuzz stuck in the finish surface. Are the bubbles showing in the open grain? Cause:
BLOOMING: If you didn't seal the wood and now have pinholes you may be able to drop fill them with unthinned lacquer. * Cheap and/or mismatched lacquer thinner;
in the glue line between the phenolic and the veneer face. A veneer that moves a lot will bubble if there is a weak spot in the glue line. or gassing along the grain.
First coat flakes off with fingernail and edges or corners chip off easily with minor impact, or bumps. After spraying about two coats the "bumps" from the filling can be sanded flat.
Out of curiosity, is the veneer backed with an actual phenolic regrind or a polyback backer? BUBBLING: I just installed a maple veneered unit that I stained and lacquered. Cause:
The lacquer will over power the cause of the hole and allow subsequent sprayed coats to flow over the holes.
and make sure air lines are free of moisture on a Daily basis.
Remedy or fix any or all of the conditions above in "causes" of Poor Adhesion. Thinner varnish will flow better and give air bubbles a chance to pop before the finish can cure. However, results cannot be guaranteed Corrections: www.woodfinishsupply.com Return to List Of Articles. The film does not level out completely because the lacquer dries before it can flow together.
I'm in Texas, where the humidity is always bad, but have never had this problem before. BLUSHING: oil based stains and pastewood fillers to control drying and accelerate cure times under cool and humid conditions. BLISTERS: laboratory testing and is believed to be accurate. * Too much air pressure or bounce-back from spraying too close to the surface; Winter: * Too much material applied per coat or coats applied in rapid succession; Also, FYI when applying the veneer with this method - you should stay away from using a J roller to apply the pressure. Fortunately, it doesn’t happen with all products–mostly with water-based products and oil-based varnishes. * Air pressure to pump should be 40 lbs. Forum Responses
Bubbles keep appearing as it dries. * Add BLUSH RETARDER to sanding sealer and lacquer as needed
air assist should remain the same. * Install a moisture trap and a moisture filter as close to the spray gun as possible.
Usually round depressions in lacquer, sometimes clear to the wood or substrate,that look like moon craters. We accept no responsibility for the results obtained by the use of this product. However, results cannot be guaranteed --- Finish lacks durability and rubs, chips, or flakes off easily.
* Close doors, - heat rooms, - heat objects being sprayed.
Corrections: * Cut back fluid and air pressure. Make sure you put a cloth in between the iron and cabinetry. * Maintain wood surfaces with silicone & oil free maintenance products. Unless otherwise agreed in writing we sell this product without warranty and our If you use an iron you should be able to reactivate the contact adhesive. * Reduce air pressure; and increase fluid pressure; and reduce film build up.
Both stain and lacquer are made by the same company.
If the iron won't set the glue or after the glue cools, it releases again, you might have to inject a little more adhesive into the bubble and then use the iron again. * Use a matched and proper thinner for your lacquer.
A raised bubble on surface of lacquer.
* Bleed traps on air lines, bleed compressor tank completely,
stains trapped under the surface of the lacquer. Unless otherwise agreed in writing we sell this product without warranty and our * Moisture trapped in the surface of the lacquer from the spray equipment or atmosphere. Any way to fix it without re-veneering? Compressor in good working order and drained once or twice daily and pressure regulator controls, and moisture trap installed in the air line as close to the spray gun as possible (within 10 to 25 feet of the gun). Note: When it is over 100 deg.F, it is best to stop and do something else. From contributor G: Cause:
Lacquer, shellac, and oil varnish/polyurethane won't generally foam, but you might get air bubbles large enough to see with the naked eye. The only effect they will have is that you see them. * Spray gun too far away from surface. You will need some way to put pressure on the bubbles to flatten them until the adhesive sets. All information following assumes: * In refinishing; -- usually from inappropriate wood care products. Solvent-Boil in Clear Lacquer coat, 100 x magnification . What might have happened in your case is that the thinner in your finish coat loosened up your contact cement.
FISH-EYES, or CRATERING:
Question I'm spraying a lacquer on red oak over a white wash or pickling stain.
* Excessive air flow pre-dries the atomized lacquer before it can reach the surface
In the future, use a 2-ply veneer. Causes: A raised bubble on surface of lacquer. * Use air assist hot spray airless for clear lacquers in summer and winter.
Wood Finish Supply * Extend Dry Times of oil based products in cold or humid conditions. Dust Collection, Safety and Plant Operation, Job Opportunities and Woodworking Services, Diagnosis and suggested fixes for a case of veneer bubbling up after finish is applied.
Undried oil based finishing materials, and/or incompletely cured oil based Causes: * Spray in an environment free from gusts or excessive air flow. What might have happened in your case is that the thinner in your finish coat loosened up your contact cement. (Use retarder as a last resort, it will slow your entire finishing and drying schedule.) I'm using an airless spray rig with a fine finish tip. * Add Star (TM) FLASH-OFF CONTROL SOLVENT to your lacquer.
Corrections: A properly matched spray gun needle, nozzle, and spray cap in good working order. customer assumes all responsibility and liability for loss or damage arising from its usage. Bubbles in lacquer are much more common than most people notice.
Lacquer and surface to be sprayed is too hot. * Clean surfaces thoroughly with naphtha (only a partial help) . From contributor B: The information presented here is based upon carefully conducted
* Keep silicones away from all wood & all woodworking tools and machinery.
This might slightly alter your approach to your fix. www.woodfinishsupply.com Return to List Of Articles.
We accept no responsibility for the results obtained by the use of this product.
Surface looks like the peel of an orange, or a miniature topographic map. You can thin the lacquer for the same effect (lower the solids content). Cause: Also, if you spray a lacquer finish, make sure you use a water based contact cement. HOW TO AVOID. * Add Star (TM) FLASH-OFF CONTROL SOLVENT as needed to your lacquer.
Cause: Too heavy of a film build-up of lacquer at one time. Solutions include applying lighter coats, or using retarder in place of straight thinner.
The information presented here is based upon carefully conducted The thicker your veneer, the less likely you'll get bubbles. laboratory testing and is believed to be accurate.
* Dusty surface or other surface contamination, poorly cleaned or prepared just prior to spraying.
* Spray lighter coats;
Question The thinner will emulsify the surface and the defects should disappear when it hardens again. Cause: (follow retarder label directions) . SAGGING, & RUNS: Acrylics can sometimes be dissolved enough with lacquer thinner to flow out the foam, but at other times, especially with water-based polyurethane, you usually have to remove the foam-laden coat and start over. Lacquer Finishing Check List
Also, if you spray a lacquer finish, make sure you use a water based contact cement.
That is the same substrate as Formica laminate.
Causes: All this advice is assuming the failure is in the glue line that you applied and not in the manufactured product, i.e. * Dry spray; from too mush air flow as in too much fan speed in a booth or outdoor spraying * Add Star (TM) BLENCO REDUCER to oil based finishing materials such as Sometimes the contact cement hasn't flashed off completely and as it gasses off after the veneer has been applied, it creates a bubble.
The film looks as if someone threw sand into the lacquer film.
Corrections:
* Spray at 8 -12 inches from surface. * The same as summer except increase pump pressure to 45 lbs., How can I fix this problem?
June 28, 2013, KnowledgeBase: Adhesives, Gluing and Laminating, KnowledgeBase: Adhesives, Gluing and Laminating: Glues and Bonding Agents.
Too heavy of a film build-up of lacquer at one time.
(Unless it says it is silicone free, you can bet it has silicone in it.) Use of Lacquer Retarder & Flash-Off Control Solvent Nine times out of 10, though, it is the contact cement. Cause: * Use as little air pressure as will allow a proper coat of material to be applied.
Thin not more than 25% unless specified by the manufacturer. If this proves to be the case you might have to re-veneer. Ignore the manufacturers recommendation to use their product full-strength.
* use less air and fluid pressure. Tiny holes that look like somebody took a pin and put holes in the film of lacquer. Solvent-Boil visible on a paint surface . * thin down the lacquer (usually not more than 25% unless specifically recommended by the manufacturer).
GRAININESS:
Try the incision and iron method first. Bubbling is a result of the agitation created by the bristles when brushing. It's a Kelly Moore brand that is manufactured by Trinity Coating company.
Corrections: From contributor S: The operative word here is phenolic. (for thorough deep drying, not just surface dry or "dry to the touch") of oil based finishing products prior to topcoating with lacquer.
* Spray at 8 - 12 inches from the surface.
Causes:
air assist should be 20-30 lbs. If you are using an oil-based finish, refer to the product label for the recommended thinning solvent. * After paint and finish removal or stripping clean surface thoroughly with Bubbles appearing in a coat of finish is one of the most exasperating problems in finishing (Photo K). and it is suggested that customers confirm results before use. PIN HOLES: October 2, 2005, KnowledgeBase: Finishing: General Wood Finishing.
POOR ADHESION & New Lacquer Cracking off of corners.
* Cut back fluid and air pressure. Corrections: Film looks bluish, or iridescent.