They combine the ease of application of rub in oils but are fortified with resins to give them a bit more durability. Oil varnish blends are an extremely popular wood finish.
Varnish Paint Stain And Solvents
Behelen Finishing Products
Refinishing Lacquer Table Top
Various other additives may be found as well such as dyespigments driers or uv inhibitors.
Varnishes Behlen B603 28806 Rockhard Table Top Urethane Varnish
Behlen B603 28406 Rockhard Table Top Urethane Varnish Satin 1
White Oak Trestle Table Finewoodworking