If it is simply dull dirty or dark with age it may be possible to revive it with mineral spirits or a rejuvenator. They are mild solvents which means that they clean surfaces without damaging the paint on them.
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Rub the polyurethane down with after wash.
Will mineral spirits remove varnish. Mineral spirits will soften a natural varnish finish so that surface material can be wiped off. Remove the sticky stuff by submerging the tool in a container of mineral spirits or if the tool is too large wiping it with a mineral spirits soaked cloth. Instead scrub it with a metal brush as the bristles will get in all the nooks and crannies and remove the polyurethane.
White spirit can also be mixed with other liquids and used as a lubricant for thread cutting. Paint thinners can be used to remove oil based paints and clean various things but unlike mineral spirits they cant be mixed with painting mediums. This premium highly refined solvent formula effectively thins and blends well into oil based paint stain and varnish produces very low odor dries with minimal residue.
Mineral spirits is not as stinky. Paint thinner is mineral spirits but in a less refined form. Sometimes called white spirit or stoddard solvent they can be used industrially for stripping paint taking grease off machine tools and removing dirt and oils from metals making them particularly useful in car part assembly.
It contains other types of solvents which makes it a lot smellier and more volatile. How to use mineral spirits. Philip mcgregor tim inman.
Wipe the wood with a cloth saturated in mineral spirits to remove the remaining paint remover. After wash is a solvent you use after paint stripper. Its best to use them on paints and varnishes that dry quickly.
With klean strip odorless mineral spirits you can achieve great results indoors without being subjected to harsh fumes. Once the sap is gone use a dry cloth. Because its more refined its slightly more effective in smaller quantities than paint lacquer thinner.
Clean the wood again with the mineral spirits and then sand the entire area with the 220 grit sandpaper. Its purpose is to clean up the end of the polyurethane as well as remove the paint stripper you used. Before starting examine the existing finish to see if it really has to be stripped off.
For more stubborn spots carefully use the 100 grit sandpaper and gently try to rub them out. My question is how do you get rid of the mineral spirits when you are ready to use the varnish again. To determine whether a particular finish can be dissolved with furniture refinisher.
There have been many such ideas offered for accomplishing the goal of stopping finishes from gelling or hardening in the can as they sit on the shelf. Use a furniture refinisher to remove paint other options furniture refinishers wax free solutions containing a blend of solvents such as lacquer thinner denatured alcohol and mineral spirits are a good choice for removing varnishes such as shellac and lacquer.
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