When the perfect box for my long imagined solar cooker project showed up on the curb across the street, I was happier than any normal 40 year old should be. After choosing a plan from SolarCooking.org and doing all the calculating and cutting and measuring, I realized that 40 year old men are not supplied with big plastic squeeze bottles of glue the way that 11 year old kids are. At least one plan mentioned wheat glue. Many of these plans are devised and written with the developing world in mind. I was surprised at how easy it was to cook up a batch of glue. The method that I used called for boiling the flour and water mixture for two minutes before removing from heat and mixing in sugar. There is a plan for a bigger batch of glue on ecochildsplay that does not involve boiling and has the addition of a little vinegar. It is a recipe that your kids could do with some assistance.
I used the entire batch of glue on my solar cooker, spreading it with a used toothbrush. I always keep old toothbrushes for those inevitable dirty jobs. I used to clean bicycle chains with them.
Wheat paste can be stored in a container for repeated use. I would advise against leaving it in the pot as that would make for some difficult scrubbing afterward.
If you try wheat glue and it turns out to be unsuitable for your desired application, you can also make glue using milk. Elmer’s Glue uses milk protein and you can replicate their product fairly easily.
Avoiding the consumption of plastic containers is only one reason to make your own glue. It can also save money. Making glue is a good kitchen ‘experiment’ for kids, with the advantage that you don’t have to eat it, although technically you could.