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
I did exactly the same thing a few years ago. Made a really kewl flying
saucer out of cardboard, complete with flashing lights, and put it
outside with a couple of "aliens".
Then the rains came and ruined it. Became one soggy mass of painted
cardboard, slumped over the bushes. Very sad.
No, there's no practical way to prevent this. Use something else or
don't put it outside. (You *could* cover it in many coats of epoxy paint
or fiberglass, but then you would no longer be working with just
There is a plastic version - formed like corrugated, but all plastic. I
would check craft stores for a more suitable surface. There is also a
painting ground, for oil or acryllic, made like masonite but with a
"primer" on it. Probably would only have to waterproof the edge, if
anything. I can't imagine anything that would reliably coat the inside
and outside of 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.
firstname.lastname@example.org is Joshua Putnam
Of all this suggestions given, this is the only one that has even a
*chance* of working. I know, because my Halloween project was
practically saturated with paint, and it did *nothing* go prevent it
turning into a soggy mess. But even the wax might not do it.
I guess the only sure way to do this would be to use some kind of
plastic (someone suggested the cardboard-like corrugated stuff).
Instead of using cardboard, use coroplast. Same construction as cardboard
but made of vinyl instead of paper. Getting paint to stick may be another
issue though. Art supply shops & framing places might have it.
DAGS for coroplast.
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