Ultraviolet light curable compositions based on iminated unsaturated polyesters for application to porous substrates

A method of minimizing absorption of a filler composition into a porous substrate comprising:

• (A) applying to a surface of said porous substrate having a surface temperature of from about 38 to about 88 degrees Celsius, a curable filler composition comprising (1) a liquid, ungelled binder of an unsaturated polyester resin having a number average molecular weight of from 500 to 3,000 derived from an ethylenically unsaturated carboxylic acid or anhydride thereof having an acid functionality of at least two and an organic polyol, said unsaturated polyester resin having been iminated with an alkylenimine containing a hydroxyl group reactive with an acid group of said unsaturated polyester, (2) one or more ethylenically unsaturated compounds different from and cocurable with said unsaturated polyester resin, (3) a pigment, (4) a free radical interiator, and (5) optionally a carrier solvent for said filler composition;
• and
• (B) curing said filler composition on said surface.

The method of said substrate is derived from wood.

The method of claim wherein said unsaturated polyester resin is substantially linear and said ethylenically unsaturated carboxylic acid or anhydride thereof is a dicarboxylic acid or anhydride and said organic polyol is a diol.