This product produces a smooth, thick, glossy surface equal to 50 coats of varnish in one application. Polytex Resin finish is for interior use and can be used on painted or varnished surfaces (photographs too) (this is not a casting resin). Be sure to use in a well ventilated heated area. Kit includes a bottle of Resin, a bottle of Hardener and detailed instructions. This 128 ounce (gallon) kit covers 32-48 sq/ft. Note: this product does have a shelf life - for best results use within 6 months of purchase.