Let cure. For exterior patching of holes that are larger than pinholes, use KBS NuMetal Epoxy Putty. Clean & prep the inside and outside of the tank using AquaKlean & RustBlast as stated above. Let dry. Scuff up area to be patched with 320 grit sandpaper then follow NuMetal ...
after 30 minutes or when the repair is tack free. The repair resin is designed to harden within 3-5 minutes and cures in 10 minutes. Repair can be made ideally at temperatures from 50 °F to 75°F (10°C to 24°C). Repairs made at lower temperatures will take longer to cure. ...
Next, each surface within the tank needs to be exposed to the Metal-Ready for about 20 minutes so you will need to rotate the tank into a new position for each exposure. Metal-Ready is a rust remover that leaves a zinc phosphate coating on the base metal. I used duct tape to seal t...