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A coat of shellac can be placed over polyurethane. You should use de-waxed shellac if you plan on placing more polyurethane on in the future.
Yes, you can put polyurethane paint over eggshell in latex or eggshell in oil.
It varies from work to work, but his famous large-scale sculptures tend to be Cor-Ten steel, stainless steel, or aluminum, painted with a polyurethane enamel or covered with a fiber-reinforced plastic skin.
Yes
Yes, as long as the polyurethane is oil-based.
Can you put stain in polyurethane to darken the color?
You can apply "oil" based polyurethane over "oil" based enamel, you can also apply "water" based polyurethane over "water" based enamel, never mix the two, there's to much of a chance for problems.
Polyurethane is usually used over stained or unstained wood to protect it from water and damage. It is a sealer.
It is not the best option . Always use polyurethane on polyurethane , acrylic on acrylic and etc ; Is even important to use them of the same brand .
With modern paints it can , but still not a good idea as it does not get sufficient 'grip' and will eventually separate.
Not successfully, it will soon come off.
yes it can, i did it on a job...