What a mess. Pro-seal is just a very messy material to work with, I literally had to change gloves every 3 minutes.
Got everything squeaky clean, extremely squeaky clean...roughed everything up with a marroon pad and double cleaned with clean white cotton rags all the mating surfaces with MEK solvent. For pro-seal to work effectively, proper preparation is a must. I did both senders in their recessed bracket first. I used 1/8th closed end rivets, longer grip ones for the bracket since the top skin component is .040 and the top of the recessed bracket is .125. I coated the mating surfaces first using a small piece of aluminum as a spatula. Then dipped each rivet in the sealant and riveted everything in place. Rivet pitch is about 3/4" which is pretty much overkill. Then I coated and riveted the tank L brackets in place using the one dimpled (countersunk) closed end rivet as a placeholder. Then coated the mating surfaces of the tank to the top skin piece of the recessed holder...then riveted everything through the tank using a lesser grip range closed end rivet.
BTW the sender is a tube type, which should be more accurate than a float type because sloshing within the tank doesn't affect it as much as the reading takes place inside the tube. Fuel enters through small holes at the top and bottom of the tube. It is a VDO 224-215 and fits nicely in the tank at this location...there is about 1/3" of space under the sender to the bottom of the tank.
