There is a process to make paper strong for papier mache .There are many ways of papier mache paste:
Paper Mache Methods
There are two basic types of paper mache.
Strip Method This is the kind we all remember from grade school. Building up layers of paper strips which have been dipped in glue/paste. This method works best for creating hollow forms like bowls and masks.
Torn strips of newspaper (or other scrap paper) are dipped in glue and then built up in layers over a form. Forms can be balloons, wiremesh such as chicken wire, or balled up paper. Good glues for the strip method are wheat paste, PVA (white) glue thinned with water, or wallpaper paste.
Pulp Method Paper mache pulp is mashed up paper mixed with a binder such as white glue or wallpaper paste, it can be very fine or quite chunky and is a bit clay like in the way it is sculpted. It works best for solid figures.
Instructions: To make this paper mache paste, start out by putting 3 cups of water in a pot and bring it to a boil. While waiting for it to boil, mix the 1 cup of flour and the 1/2 cup of powdered glue resin together. Slowly stir in 1 cup of very warm water. Once it is all blended together, beat this mixture briskly to remove lumps.
Once pot of water is boiling, slowly stir in the flour mixture. Mix well and let it boil for 2 - 3 minutes or until it is clear and smooth.
If you don't like the smell of the glue mixture you can add a few sprinkles of cinnamon or cinnamon to sweeten it up!
By adding a few drops of oil of wintergreen can help make the paste last longer.
One can store this glue in a covered bowl or jar, in the refrigerator, for a few days.