Try using a small amount of Rubbing Alcohol. Brush or dab a small amount over the white marks, this may help release the moisture by softening the finish. Always do a test area first.
If the product has cured and will not release the moisture try acetone or nail polish remover in very small amounts to affected area only.
If these don't work get out the Furniture Stripper and start again.
Try and avoid polyurethane!
Try this product or something similar: Varathane Diamond Interior Finish, Water-Based
Often, poly will not adhere due to contaminants on the surface. Remove all of the loose coating, sand the surface, brush off the surface with a brush, then remove the remainder the dust with a tack cloth.
Bleach
To achieve a Matt finish on polyurethane you must sand it with a grade p400 average particle size in microns(in inches) .00137. this will defuse the light rather than reflect the light. you can always use a matting solution such as turps but it can get very messy and sticky if you don't know what you are doing.
You don't. You will most likely have to restain after stripping.
You can remove stains or blemishes from a polyurethane watch by scrubbing it with a wet terrycloth that has been dipped in a solution of warm water and liquid dish soap. For tough stains, dip a melamine foam sponge into the solution, ring out and wipe the watch gently. Dry well with a clean towel.
how to remove polyurethane from a brass bed
Often, poly will not adhere due to contaminants on the surface. Remove all of the loose coating, sand the surface, brush off the surface with a brush, then remove the remainder the dust with a tack cloth.
Try Goof-Off, you can get at Home Depot and Lowes, but test it first on an inconspicuious spot, as it may remove your finish, but it's supposed to remove marker and crayon. Good Luck!
Bleach
flooring
To achieve a Matt finish on polyurethane you must sand it with a grade p400 average particle size in microns(in inches) .00137. this will defuse the light rather than reflect the light. you can always use a matting solution such as turps but it can get very messy and sticky if you don't know what you are doing.
You can remove polyurethane from fabric by scraping off the excess using a rubber scraper. Use the blade of a sharp knife to further remove the top layer of polyurethane. Then, apply acetone to the stain and allow it to work for 10 minutes before rinsing the fabric with water. If the fabric is white, soak it in bleach and water for 30 minutes, then wash as usual.
Remove the patches before applying the AED pads.
did lomela crem can having the property of removing the black patches on the fore head
You don't. You will most likely have to restain after stripping.
Remove the door from it's hinges by pulling the hinge pin out. Sand the door down to bare wood. (Or use chemical products to remove old finish.) With a clean paint brush, apply your new finish to the door. If it's a stain... let it sit until it gets to the desired darkness and then rub the rest off with a clean cloth. A couple of coats should do it, with a light sanding in between. Finish off with polyurethane. Rehang door when satisfied. That's about the best I can tell you with the little information you gave.
Yes