#110 Inner Panel Rustproofing Compound is formulated for the inner panels, hidden boxed in-areas and other rust prone areas in trucks, buses, and cars.  This compound is a blend of rust inhibiting materials, wax, resin, and mineral spirits.  At 6-8 mils wet, inner panel rustproofing provides excellent protection against rust.  When dry, the material remains elastic and does not crack or peel.