The whole under body of my 40 has a ridiculously thick layer of tar/oil based under body coating. That is what I discovered after ripping off a nice thick layer of truck bed liner. What is the best way to get this stuff off? I can't see sand blasting working and dipping isn't really an option right now. I am hoping the answer isn't heat gun and putty knife.
Underbody coating removal?
- Thread starter joeyg1973
- Start date
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This may be a huge task I have the same oil based tar undercoating the only thing that kind of works is spray it with a solvent let it sit then power wash it off,the creases seams and hard to get to corners are the most difficult.
The power scaler just gets clogged up by tar build up and doesn't work it is good for hard undercoats like Rhino and some of the other brands that have a hard finish.
Good luck if you come up with an easier faster way please post it since I have a second cruiser with the same undercoat I want to remove for a rust check.
The power scaler just gets clogged up by tar build up and doesn't work it is good for hard undercoats like Rhino and some of the other brands that have a hard finish.
Good luck if you come up with an easier faster way please post it since I have a second cruiser with the same undercoat I want to remove for a rust check.
Some of these oil and wax based coatings will melt away with brake cleaner. I would try a power washer first, it might take most of it off it off without a solvent, if so then use a solvent to finish it off. If real thick the power washer should be able to peal most of it off.
I had a guy that has a sandblasting shop tell me he could get that stuff off with no problem.
I'd try a spot with some aircraft stripper and see what it does. Just coat it and let it sit for a couple hrs. Then pressure wash it off.
I'd try a spot with some aircraft stripper and see what it does. Just coat it and let it sit for a couple hrs. Then pressure wash it off.
On rust thicker metal no problem. But if your wanting a nice smooth finish on the back of what your hitting you will be in for a big surprise.
thecrazygreek
A.K.A. TheCraftyGreek
Oxy Acetelene Torch and a scraper, sorry...
The other ideas may work...
The other ideas may work...
Or just a simple propane torch and putty knife... and lots of elbow grease 
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Ratpuke
SILVER Star
I ditto the brake fluid comment. The bedliner had separated from the steel in areas where brake cleaner spilt on the floor. Some has also come off due to sitting in standing water (rain seeps in and pools on the floor) - little help to you, unless you park your rig in a lake for a little while. 
undercoating ---yuk
Went through this myself
I found a wood chisel worked good on loose areas and got a lot off--in really tough spots I used the propane
I tried every noxious chemical I know and didnt have much luck
once you scrape it then a 3M paint wheel will take off the residue pretty good then follow with a solvent cleaner
for the final clean I used Undergone then oshpho and finally TSP
it kinda bites doing this job but work a small area at a time getting it almost perfect then go over the whole thing and eventually you will get there
Went through this myself
I found a wood chisel worked good on loose areas and got a lot off--in really tough spots I used the propane
I tried every noxious chemical I know and didnt have much luck
once you scrape it then a 3M paint wheel will take off the residue pretty good then follow with a solvent cleaner
for the final clean I used Undergone then oshpho and finally TSP
it kinda bites doing this job but work a small area at a time getting it almost perfect then go over the whole thing and eventually you will get there
- Thread starter
- #12
Undergone? I Googled it and came up with a band. Got a link?
eastwood undergone
Eastwood's Under Gone Undercoat ing Remover - Chassis/Frame Paints - Specialty Coatings
here ya go
Eastwood's Under Gone Undercoat ing Remover - Chassis/Frame Paints - Specialty Coatings
here ya go
I've used a sand blaster on the undersides of a vehicle where the coating was fairly dry or older. I got a do-it-yourself kit from Eastwood and wore a good mask and hood. I just laid on the ground outdoors under the vehicle (easy on a land cruiser) and blasted away. It's a little slow but I did most of the bed and any seams or welds that looked suspicious
There's a lot of silica dust that ends up on everything so on a 40 you could just leave the top on and roll up the window, close the vents, etc. Plug any engine openings and wrap an old blanket around the block. Wash all the dust off with a metal wash product when you're done and then drive it into the shop on its own power and start your disassembly, paint, whatever.
There's a lot of silica dust that ends up on everything so on a 40 you could just leave the top on and roll up the window, close the vents, etc. Plug any engine openings and wrap an old blanket around the block. Wash all the dust off with a metal wash product when you're done and then drive it into the shop on its own power and start your disassembly, paint, whatever.
Anything with a soft or rubbery consistency will not sandblast well without a lot of time, air and sand(or any abrasive) I have used a knotted/twisted wire wheel on a 4.5" angle grinder to remove bedliner, undercoat and weatherstrip. They are not cheap for a good one, but far less than having a sandblaster do it.
JMO
Ed
JMO
Ed
