How TO MAKE LIQUID STARCH Mix together 2 ½ cups of tap water and 1 ½ tbsp cornstarch in a saucepan (make sure there are no lumps). Bring the mixture to a boil for 1 minute then cool to room temperature. Pour it in a glass spray bottles NOTE When you heat the starch it helps it stay suspended and works perfectly:THEREFORE IT WON'T HAVE ANY clogging,