Transparent latex finish system for exterior wood

Claim 1

METHOD OF FINISHING OF COATED AND UNCOATED WOOD SUBSTRATES WITH A CLEAR, TRANSPARENT PROTECTIVE COATING WHICH COMPRISES THE STEPS OF: (I) APPLYING TO A WOODEN SUBSTRATE A LIQUID LATEX-BAXES ON PRIMER COATING COMPRSING FROM ABOUT 45 TO ABOUT 55 WEIGHT PERCENT OF NON-BOLATILE POLYMER SOLIDS OF A FILM-FORMING LATEX OF AN ACRYLIC INTERPOLYMER COMPOSED OF (A) FROM ABOUT 60 TO ABOUT 80 PERCENT BY WEIGHT OF THE INTERPOLYMER OF AT LEAST ONE INTERPOLYMERIZABLE ACRYLIC ESTER WHICH BY ITSELF FORMS SOFT POLYMERS AND WHICH IS SELECTED FROM A GROUP CONSISTING OF ESTERS OF ACRYLIC ACID AND PRIMARY ASLKANOLS OF BETWEEN 1 AND 18 CARBON ATOMS; OF (B) FROM ABOUT 39 TO ABOUT 18 PERCENT BY WEIGHT OF THE INTERPOLYMER OF AT LEAST ONE INTERPOLYMERIZABLE MONOVINYLIDENE COMPOUND WHICH BY ITSELF FORMS A HARD POLYMER AND WHICH IS SELECTED FROM THE GROUP CONSISING OF ALKYL METHACRYLATES IN WHICH THE ALKYL GROUP CONTAINS FROM 1 TO 4 CARBON ATOMS, TERT-AMYL METHACRYLATE, TERT.-BUTYL METHACRYLATE, TERT,-AMYL ACRYLATE, TERT.BUTYL ACRYLATE, CYCLOHEXYL ACRYLATE, CYCLOHEXYL METHACRYLATE, AND ACRYLONITRILE; AND OF (C) ABOUT 0.5 TO ABOUT 2.0 PERCENT BY WEIGHT OF THE INTERPOLYMER OF AT LEAST ONE INTERPOLYMERIZABLE A,B-UNSATURATED CARBOXYLIC ACID; (II) AIRDRYING SAID PRIMER COATING; (III) APPLYING A TOPCOATING