Thanks again for all the input on removal of the undercoating. I have
completely cleaned one inside wheel well and inner fender of the stuff and
done mass removal on the other side. Heat was definitely the best thing to
use to remove the bulk of the material. I used an electric paint removal gun
on high and a flexible metal spatula with a slight curve to it. The curve
helped scrape the radius of the wheel wells.
To remove the remaining undercoating and primer, I used an Old Milwaukee 2 >"
knot cup brush attached to my angle grinder for most of it and a Norton 80
grit flap disc I bought at home depo for some of the flat areas. The flap
disc is more aggressive than the cup brush so I used it sparingly. The cup
brush worked really well especially in corners and in seams.
This is my fourth TR6 that I have done body work on but the first where I have
gone after removal of this stuff. I thought I knew where all the usual
suspects were for rust but by removing this, I think there is another. On the
inner fender, just above the floor, there is a line of pinhole rust through
spots that I doubt I would have found if I had not removed the undercoating or
the interior padding over the rear wheel arches. I think this demonstrates
that although this stuff can stick well in one spot and provide excellent
protection, in others where it peels, it can actually trap moisture against
the steel and cause rust.
Bob Clark
'69 TR6
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