Why is it a problem if it touches the sights? EvapoRust recommends immersion. Try wetting a rusty piece and soaking another. The soaked piece comes out much better. Ive tried it on antique ventilation grates.
Will not affect plastic, PVC, Viton and most paints
Contains no solvents, acids, bases or hazardous ingredients
Safe on soft metals, plastic, rubber, PVC and other surfaces unharmed by water alone
