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Joshua Putnam

In article ,
says...
I have some corrugated cardboard
halloween decorations that I would like
to put out on the lawn. Last year, when
they got a little wet, they curled and
"melted" a bit. BTW, las Halloween was
constant rain. Does anyone know of a
way to waterproof the cardboard? The
surface is black colored paper.
Interrnally, it is like any other
corrugated cardboard.

It's pretty easy to do with canning wax and a big paint brush. Melt the
wax in a double-boiler and brush it onto the cardboard slowly so it
soaks in while it's still molten. (The thermal mass of wax in the brush
will keep it hot longer -- if you brush too fast, it will solidify
before it penetrates.) Take extra care on the edges to make sure it
soaks into the center corrugation as well as the outer layers. Then
make a second, faster pass over the edges that will block the
passageways so water can run inside.

For larger projects, good outdoor-fabrics stores will have 5-gallon cans
of wax in solvent that's used for waterproofing canvas.

--
is Joshua Putnam
http://www.phred.org/~josh/
Braze your own bicycle frames. See
http://www.phred.org/~josh/build/build.html