Standard and infrared heat guns are expensive, but reusable; they require minimal time to soften varnish and stain, but only cover one small area at a time. Thus, oil-soaked rags and paper can smolder and ignite into flames, even several hours after use if proper precautions are not taken.
Most liquid chemical and citrus-based gel paint strippers remove varnish and stain. All clear or translucent varnishes, and indeed all film - polymer coatings e.
Generally, petroleum solvents, i. Infrared guns are used the same way as traditional heat guns; they still can burn your skin, but they do not produce as much heat as traditional guns.
Today this varnish would have faded and currently be a very warm, dark orange. Citrus strippers have less odor, but they work slower and may require two or more attempts.
In classic varnish the cure rate depends on the type of oil used and, to some extent, on the ratio of oil to resin. Please improve it by verifying the claims made and adding inline citations.
Stripping With Heat Heat guns work quickly, but cover less ground at one time than chemicals. UV-absorbers are added to polyurethane and other varnishes e.
Prepared shellac is typically available in "clear" and "amber" or "orange" varieties, generally as "three-pound cut" or three pounds dry shellac to one US gallon of alcohol.
Some violin finishing systems use vernice bianca egg white and gum arabic as a sealer or ground. Scrape off the varnish with a paint scraper or a putty knife. These claims may be more or less realistic, depending on individual products. Chemical-resistant gloves and eye protection are important, even with milder citrus products.
Better and more expensive exterior varnishes employ alkyds made from high performance oils and contain UV -absorbers; this improves gloss-retention and extends the lifetime of the finish.
A heat gun might leave more stain behind than liquid or gel strippers, so you may need steel wool, rags and turpentine or stripper to loosen the last traces.
The least-expensive way to strip while covering the most ground is a traditional chemical stripper, with citrus strippers being a bit more costly. Shellac clean-up may be done either with pure alcohol or with ammonia cleansers. True polyurethanes are two-part systems. Oil, polyurethane, and epoxy varnishes remain liquid even after evaporation of the solvent but quickly begin to cure, undergoing successive stages from liquid or syrupy, to tacky or sticky, to dry gummy, to "dry to the touch", to hard.
Generally, petroleum solvents, i. The resins include amberdammarcopalrosinsandaracelemibenzoinmasticbalsam, shellacand a multitude of lacquers.
Various priming techniques are employed to overcome this problem, including the use of certain oil varnishes, specified "dewaxed" shellac, clear penetrating epoxy sealer, or "oil-modified" polyurethane designed for the purpose.
When the stripper has softened the varnish enough for scraping, the surface appears wrinkled or bubbled. Safety[ edit ] Because of flammability concerns, many product containers list safety precautions for storage and disposal for varnishes and drying oils as they are flammable, and materials used to apply the varnishes may spontaneously combust.
Conversion[ edit ] Used when a fast-curing, tough, hard finish is desired, such as for kitchen cabinets and office furniture. Certain polyurethane products are "hybrids" and combine different aspects of their parent components.
Conversion[ edit ] Used when a fast-curing, tough, hard finish is desired, such as for kitchen cabinets and office furniture. Better and more expensive exterior varnishes employ alkyds made from high performance oils and contain UV -absorbers; this improves gloss-retention and extends the lifetime of the finish.
Choosing a Stripping Method Liquid and gel strippers soak into the finish to loosen it, and heat guns work by softening it; both methods require scraping. Usually the pot-life is a matter of a few hours but is also highly temperature dependent.
Hold the gun as far from the surface as the gun manufacturer recommends, then scrape off the softened varnish and stain with a paint scraper or putty knife before it cools. The first is a blend of an amino resin and an alkyd. Varnish is a clear transparent hard protective finish or film.
Varnish has little or no color and has no added pigment as opposed to paint or wood stain which contains pigment.
However, some varnish products are marketed as a combined stain and varnish. Stir the stain well, then use a clean cloth to rub the stain into the wood in a circular motion.
5. Wipe off the excess stain using a clean cloth. Allow the stain to dry 6 to 8 hours. 6. Brush a coat of polyurethane varnish onto the surface, then finish up with long, light brush strokes to remove bubbles and lap marks.
7. Apply Stain. Choose from Minwax® Wood Finish™, Minwax® Gel Stain, or Minwax® Water Based Wood Stain and apply according to label instructions. For expert application tips and specific advice for staining some of the more popular wood types, see the Guide to Staining Interior Wood.
Staining Interior Wood Basic tips and advice on choosing and using wood stains. Home \ How-to \ Staining Interior Wood. Tweet. Click on any of the topics below, scroll, or use the arrows to the right to navigate through the how-to steps and tips from Minwax®. Always apply a liberal coat of a pre-stain wood conditioner prior to staining and.
A durable finish for woodworking pieces, furniture, and flooring, varnish beautifies wood and protects it from scratches and stains. To the uninitiated, achieving a smooth and lustrous look may. Marine Varnish Marine Varnish has long been used as a protective and preventative agent for protecting wood in a wet, marine environment.
Spar varnish formulations for use on boats are typically a mix of oil, resin, solvent, dryers and ultra-violet additives.How to varnish wood