How Would You Fix Small Hole in Oil Pan (a la mexicana)?

(Posting on FBBO also) My Mexican neighbor asked me what kind of product (silicone, etc.) he could use to patch his oil pan (he hit something on the road today). I told him maybe a product that plugs small holes in fuel tanks might be suitable. Anyone know from experience what he could apply that would work? Thank you.
Ala Mexicana? Bubble gum.