I wanted to try the dry ice method of removal and yesterday bought 5kg of pellets
Dry Ice pellets
Turned out the boys shovelling it into the chillybin were generous and i got over 10kg! Thanks guys.
I then shovelled the ice into a dozen plastic bags, spread them over a section of floor, covered them with a couple of sacks and left for approx 1/2 an hour. First section i tackled was the passenger floor
1st section done, took less than 10 minutes - Sweet
I found using the air hammer very effective, angled at about 45 degrees it shocked the tar off in chunks, (the dry ice having made the tar brittle first) I did try hammering with a dead blow hammer but felt there was more danger of bending the floor. Here's a video of the system in action, excuse quality- its hard to film with one hand and hammer with the other!
I thought it worked very well on the floorpan and some of the transmission tunnel panels, on the rear wheel arches not so well i think because of the type of material and being vertical it was hard to keep the dry ice in position.
Generally floors are good
Rust coming through here
The worst area, fairly easy to fix though
Cutting required to reveal more
About 15kg (33lbs) taken out
Final verdict - $25NZ well spent, having already used hot gun and scraper on a couple of other areas i would rate this method as better, easier and a lot more fun! It removes i would guess 98% of the tar and the rest will be removed with hot gun and scraper or solvent. It was not so effective on the seam sealant and areas of this will need to be scraped off where i need to weld
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