it should
Yes, it works well with that.
No, it's used to thin and clean polyurethane and acrylic resins.
you can hack it with a hatchet and then use a good multi purpose thin set to adhere it on the old installation
Yes, both oil and water-based polyurethanes will adhere well to an item coated with acrylic paint. If it is a polyurethane paint, dull the surface prior to painting. If it is a clear. realize that that oil based polyurethane will impart an amber hue while a water based polyurethane is crystal clear and will not affect the color.
PU Leather does not breath as the layer of synthetic polyurethane does not allow moisture to move through it. The reason leather can stay in good condition through wear and wetness is it can rid itself of moisture. The polyurethane layer cover also does not age or wear. The thin layer of leather used un the polyurethane was normally a useless thin layer of leather before it was used as the under layer in PU leather.
I wouldn't recommend it. Most wall tiles are very smooth and wouldn't have any grit for the thin-set to adhere to.
The thin set under the board is to fill in any low spots in the floor. It is not to adhere the board to the floor. It is preventative against deflection. If there is a low spot and you do not fill it in, the board will flex and the grout/ tile will crack. Do not use construction adhesive it will do more harm then good.
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.
If you mean an oil based polyurethane, no, it will dry too hard and will chip off over time and normally isn't meant for exterior work. A better option would be to use a 100% acrylic clear polyurethane, paint or solid stain. They are adhesive enough to adhere to vinyl fencing or decking and will flex during freeze/thaw cycles.
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