Another option is to use thin set mortar in your top layer of paper mache and paint with exterior house paint.
Waterproof paper mache.
Stir the flour and water together until a paste forms then set the paste aside.
Specifically formulated to block moisture spar urethane will not only waterproof paper mache but also contains uv blockers that put it in the weatherproofing category.
Some other tips that can improve your prop s chances of surviving the winds and rains of october.
This forms a hard exterior shell.
If you intend the item to be near water or outside you will need to finish it with such sealants as tempera paint for children s craft items to marine varnish for an outdoor sculpture.
There is paverplast powder that is mixed with a textile hardener but either can be used by themselves it is waterproof and can be used for outdoor projects.
Fear of losing it after all that hard work just seems to be too great a risk to me.
It s a great method for outdoor statues or anything you want to look like concrete.
Here s an easter island head i made.
9 1 2 plastic plate i bought at a thrift store you could also use a plastic bowl of the size you choose water bottle you could substitute a pringles can etc plaster plaster cloth masking tape newspapers paper pulp rust oleum leakseal acrylic paint.
To make papier mâché first add 2 cups 240 grams of flour and 1 cup 240 milliliters of water to a large bowl.
Next tear or cut enough 1 inch wide strips of newspaper to cover the object you re papier mâchéing 3 times.
When i have spent hours and hours creating a piece of artwork usually the very last thing on my mind is sticking it out in the garden.
However i have always been curious as to just what is the best.
The downside is that you lose a lot of detail and it makes for a pretty grainy rough surface but it will be waterproof.
It is a non toxic line of products used for sculpting with fabric and paper among other things.
Then apply at least two layers of the mortar paper mache mix directly to the foam.
Aug 05 2005 papier mâché is not waterproof or water resistant unless you seal it or use an additive in the mix.