I do a lot of outside restoration and find myself wanting to return to a
building material that my brother and I used to make a home for our HO
trains: water putty.
When you're faced with a severely-furrowed, water/sun-damaged surface,
will water putty stand the test of time as an exterior product? If not,
Of course I'm painting over it.
If you are talking about the tan powder that comes in a can and is mixed
with water then no, I wouldn't use it outside. You can get the same thing
much cheaper by using setting drywall compound.
You would do much better using Bondo. You would do even better using epoxy
thickened with whatever.
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