Why do I have bleed through?

You should not have rust coming to the surface unless Rust Bullet was improperly applied. Wipe down the coated surface with Rust Bullet Solvent and inspect the surface to rule out the possibility that the rust stains are caused by rusty water or fluid that has dripped onto the surface coated with Rust Bullet from another area that was not coated. If another application of Rust Bullet is necessary due to an inadequate initial application, etch the existing coating with Rust Bullet Metal Blast or scuff up the surface with 100 to 150 grit sandpaper and apply an additional two coats of Rust Bullet or Rust Bullet Automotive. Remember, surfaces to be coated must be completely dry.