I'm rebuilding my truck right now. I went to Eastwood and bought a bunch of their rust solutions.
Internal frame coating inside the frame, the door bottoms, cab corners, inside the rockers, inside the front fenders, interior floors along the door sills and driver/ pass floors. All till it was running out the drains
HD Antirust inside the doors.
Chassis black extreme primer, 2 coats, and Chassis black paint extreme, 2 coats, on the frame after sand blasting it.
Black rust encapsulator on the axles and front suspension along with 2 coats of chassis black paint.
Spectrum rubberized sound deadener from Second Skin Audio on the exterior cab floor to about 3-4 mils thick and inside the front doors and on the front seat floors and trans hump.
Hopefully that will buy me some time. I am replacing the cab with a donor from a 01 1500 gasser truck I bought in Alabama. Clean as a whistle, 1 women owner, 171k.
From underneath there is some plastic plugs I pulled. Eastwood has these extension nozzles for the spray cans. About an 18" clear tube and a brass tip with 5 jets drilled. Works really well. My rear body is done for so I'm just putting it back to buy some time. I'm looking at a aluminum flat bed from Martin's Welding. Looks like nice work and the price works for me. Bodies up here are more even with shipping from them. I thought about driving down to have one installed but it would be cheaper to ship vs the expenses to travel.
http://www.martinswelding.com/
make sure you put a drop cloth down, wear gloves and have good ventilation and or a respirator. The fume are potent. Respirator is a must.
The Eastwood sounds like a pretty good product and I'm about ready to order it. However, after more reading I'm interested in the Krown product guys are talking about also. Didn't see a website for Krown, but I'm gonna get something, Been getting a ton of snow and salt here and don't want this truck to have the typical rusty dodge doors
I tried the KROWN on the truck and wife's car this year. It seems like a good product and the guy applying it knew what he was doing. Very quick and efficient. They have to attend so many hours of training every year to retain their llicense. Not just the employer but all employees who will be applying the undercoating. They spray in all the hinges and latches and drill holes in the bottoms of the doors and spray inside the panels with a little wand. I think something like this is better for vehicles that are older and have never been treated because rather than just covering any rust you may have going on it draws into it and helps to neutralize the oxidation process.