Yes, you can put polyurethane paint over eggshell in latex or eggshell in oil.
Yes
Yes, as long as the polyurethane is oil-based.
Can you put stain in polyurethane to darken the color?
yes
No, it isn't.
Yes, you can put polyurethane paint over eggshell in latex or eggshell in oil.
Yes
Yes, as long as the polyurethane is oil-based.
Can you put stain in polyurethane to darken the color?
The best way to stain cabinets is to apply the stain over shellac then shellac over the stain last step Zip Guard over that to protect surface from moisture damage
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 .
no, you would have a messy lumpy floor
yes
With modern paints it can , but still not a good idea as it does not get sufficient 'grip' and will eventually separate.