Normal
Wire brush until shiny, put masking tape on the outside, and skim the pitted/pinhole areas with JB weld made for aluminum. Once it's set, remove the masking tape. JB makes a very, very good product that lasts for many years, as long as you got the area nice and clean for a strong bond. Once sandwiched between the layers, you shouldn't ever have to worry about it, but I would recommend painting the inside of the skin after patching, to prevent further corrosion in there.Titebond II or Titebond III should work well for you. You certainly could use a 1/8"x1/8" notched trowel to spread it for full coverage, but do it with the flat side of the trowel first, as much of it will be absorbed, and then switch to the notched side, so you get a good bite into the wood for a very strong bond.
Wire brush until shiny, put masking tape on the outside, and skim the pitted/pinhole areas with JB weld made for aluminum. Once it's set, remove the masking tape. JB makes a very, very good product that lasts for many years, as long as you got the area nice and clean for a strong bond.
Once sandwiched between the layers, you shouldn't ever have to worry about it, but I would recommend painting the inside of the skin after patching, to prevent further corrosion in there.
Titebond II or Titebond III should work well for you. You certainly could use a 1/8"x1/8" notched trowel to spread it for full coverage, but do it with the flat side of the trowel first, as much of it will be absorbed, and then switch to the notched side, so you get a good bite into the wood for a very strong bond.
