1. How do I paint an existing 2-coat plaster finish on an exterior surface?
Either apply Waterproof Finish or Ultra-Mix by Peletico (solution 1) or apply, using a trowel, one coat of Exterior Pelemura and then two coats of Fine Exterior Pelemura crosswise (horizontal and vertical) to achieve a smooth surface (solution 2).
Apply primer EcoPrimer by Peletico (water based), or Masonry Conditioner by Sherwin-Williams® (solvent based).
Apply 3 coats of Loxon® Exterior Masonry Elastomeric coating by Sherwin-Williams® , or 3 coats of Perlotex Matt fine textured paint by Peletico.