removing floorboard undermatting

[n2666s]

OK, got around to stripping the floorboards on the 74 today.......few rust pin holes on the PS...... etched with the rustbullet metal prep BUT on the DS...the removal of the tar like toyota undermatting is an absolute PITA, power tools including wire brush; flapper wheels, stripper wheels just bounce off this junk; tired of the old hammer chisel technique as are the neighbors and open to ideas.......TIA

Lou

 

[hicruise55]

To remove the tar-like undermatting... put some dry ice on it for a bit then whack it with a dead-blow hammer, it will come up in chunks

Have fun!

 

[jimhendrixx]

Yeah dude, i heard dry ice works great.
Best of luck to yoU!

 

[DesertLake]

I had the best luck with dry ice, then used a plastic chisel to get underneath and pop most of it up. Too bad I only did that on the last third! As for the little bits left over, wd-40 or goof-off work well to dissolve it once its thin, but I've been using a dull plastic chisel to knock off the larger chunks. I keep the chisel pointed almost but not quite straight down, so when I strike it with a hammer it scrapes off the tar but leaves behind the paint. Good luck!

 

[n2666s]

undermatting removal + dry ice

well; bought some dry ice and honestly did not see a great improvement......maybe the day was too hot........80ish....think the chips were slightly bigger but still had to hit them with a chisel and hammer till had to give it up 'cause of neighbors/noise about 80% done anyway; will wire wheel it when completet; hit with rust bullets etching....... then rust bullets and rattle can the floor........... then Lowe's version of Dynamat, then cover with the remanents of the original carpeting as much as I hate that %#@*:">+^%$ undermatting; it did protect the Drivers side from the corrosion seen on the Passengers side!

Lou

 

[DesertLake]

I left the dry ice on for 15-20 minutes, and chiseled under it sideways....hth

 

[Trollhole]

I got pissed at mine and hit it with an air chisel. It came up pretty well. I think if you were gonna be repainting it anyway aircraft stripper might work well.