Regarding corrosion prevention: I have a lot of recent experience with tub
repair/galvanic corrosion. I removed the tub of my 109SW by unbolting it.
Then I removed it. it did not fall on me because it rested on its perches
after being unbolted. the stiffeners running longitudinally were rotted as
were the right angled steel stiffeners (the ones at right angles to the
frame rails). I replaced the steel stifeners with galvanized ones. I
painted the surfaces of these stiffeners where they contacted the tub and
the aluminum longitudinal stiffeners with self etch and rustoleum gloss
black to isolate and make for a slicker interior to make cleanout a little
easier. Anal? Yes. I found U channel that fit over the rotten
longitudinal stiffeners. I painted it. I fitted it over the cancered
longitudinal stiffeners after stripping the tub to bare metal and painting
with self etching primer and rustoleum gloss black. I stripped the tub with
a grinder and a drill, both fitted with #-M strippers and sanding discs, as
well as hand scraping. I then placed a rivetted patch over a corrosion hole
caused by galvanic corrosion between the right angled stiffeners and the tub
floor. I then splooged the underside of the tub heavily with Herculiner.,
especially the frame mounting points, which I have observed suffer from
galvanic corrosion often. I also used it on the middle and front floor
panels, as well as the heel kick panel for the middle seat passengers.
This past sat and sunday, I sanded and duplicolor bedlined the interior of
the tub. I did not use Herculiner because herculiner is like a cheese
grater. herculiner does flow better than the duplicolor, but the duplicolor
is softer. The "nappy" roller the duplicolor kit comes with (on sale, 40
at schucks), is cheap. I would replace with another before using. I also
like that duplicolor comes in spray cans, making corners easier, as well as
touch up and repair. OTOH, the herculiner spreads better, and the texture
in it is built in, and not dependent on the nap roller.
Beware of paint reaction with dupliclor bedliner. I had no observed
problems with this with herculiner. With duplicolor, I had paint reaction
in spots similar to using a paint stripper. It bubbled and in one instance
the paint came away with the roller. there was no rhyme or reason to it.
It affected old and new paint, as well as plain self etch primer. One
dried, I could peel sheets of the duplicolor away, in one case, down to bare
metal.
This gets me to your question about removal or bedliner. With both
herculiner and duplicolor, the 3-m paint and rust removal wheels work well
on bedliner. To solve the paint reaction problem, I took the bedliner off
in big patches with one of these wheels, then sanded the edges and reapplied
the duplicolor to bare metal (no time to let new paint cure)
If scuffing your knees is not a problem I would use herculiner on the
interior floors. I did not use it on the tub floor because I envision
sleeping back there a time or two, and my dog is not getting any younger and
I think the dupliclor will be easier on her. Also, I think the dupliclor is
easier to patch and cheaper as well as easier to get. I used herculiner
underneath becuase I think its tougher then dupliclor.
I think bedliner is a good way to isolate dissimilar metals because it is
very tough. Otherwise, use rustoleum gloss black, as it has high solids
content and is easier to clean than flat black.
Simon
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