i want to laminate polyurethane based polyester on some surfaces such as glass and metal but detaching is a problem, what is the best way to detach without damaging the main substrate?
If you are looking to laminate polyesters with urethane and want to use the glass or metal as a reference flat surface, just treat the surface with a wax, hydrocarbon oil, or a fluoro type release agent. We use reference surfaces of steel which have been treated with wax (either paraffin or candle wax works for us). If you want to make a form for multiple uses, build the form out of stress relieved HDPE.
Scot Abbott thanks for useful comment, we make polyurethane sheet but one of our problems is that how adhere this sheet to surface such as body's car or glass which detaching is not damage substrate? our sheet is not adhesive to surface.
You implied HDPE, is good for substrate of polyurethane?
I dont exactly understand your question. If you wish to apply a urethane sheet to a steel or other surface permanently, just spread some urethane reaction mixture on the 2 cleaned pieces while they are apart and hold them in place until the mixture becomes a solid. If you are making a shaped, thin piece made of a urethane, you might do it by coating or spraying the urethane reaction mixture onto a hdpe substrate of appropriate shape. The shape will be correct when the reaction is complete, and it can be removed from the HDPE for application to the steel or other place you desire to adhere the piece.
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