I used it on pinholes up to 1/2 pencil size near the weatherstripping under the sill plates on by 64. IT WORKS GREAT.
steel brush it put tape under it loosely and smear it on. It sticks to rusty haze better than bare metal. You won't be sorry, other than the price.


64 & 66 GMC long fleetside 4x4
Cartwright, OK