Broadly speaking, waterproof spray is any sort of coating that seals out moisture. … It is common, for instance, to waterproof clothing and supplies like sleeping bags and tents that will be used outside.

How do waterproofing sprays work?

Fabrics and other materials have pores through which water permeates, waterproofing sprays fill these pores up with some type of wax, oil, rubber, or glue making whatever it is put on waterproof to some extent.

How do you apply waterproof spray?

Hold the spray bottle about six inches away from the fabric you want to waterproof and apply an even coating, making sure to reach under all of the fabric’s flaps and folds. Let the fabric dry for a couple of minutes, then remove any drips or puddles with a damp cloth.