He soon incorporated whale oil into the formula, although many changes have been made over the years. Rust-Oleum products no longer contain whale oil, instead using resins derived from alkyds, polyurethanes, epoxies, latex, etc.
He soon integrated whale oil into the formula, though numerous modifications have been made over time. Rust-Oleum products no longer include whale oil; instead, they utilize resins derived from alkyds, polyurethanes, epoxies, latex, and so on.