I'm looking to replace old, ugly, uPVC exterior cladding with quality timber. I'm looking for flat, opaque colour finish. Have previously used Valtii opaque paint on exterior timber - very, very good. Supplier is offering Olympic PPG Acrylic paint finish - my questions are 1> is acrylic microporous, as the Valtii paint is, and 2> anyone any experience of this product? Looking for low maintenance, high durability obviously.