Polymers may be pure acrylic polymers (example based on methylmethacrylate and alkyl acrylates such as butyl acrylate), styrene-acrylic (example based on styrene and alkyl acrylates such as 2-ethylhexyl-acrylate), vinyl acetate copolymers with alkyl acrylate or ethylene or maleates, and styrene-butadiene based polymers.