methocel = methyl cellulose is a food grade thickener that may be able to be purchased in bulk cheaper but I get mine at Dharma Trading Co. It is used by fabric designers in marbling fabrics, thats why I happen to have some around the house. Bennett your right to ask about heating it, in powder form it's probably more explosive than grain dust and must be handled very carefully. But once in solution it is a completely safe and non toxic, can be disposed of down the drain. Dharma sells it for around $2.00 an ounce, I used 11gms to 4 cups of water, so it is kinda high, especially since its a one time use item.
I really have high hopes for the shaving cream, cheap, available everywhere, and my wife won't ask any questions! I'm gonna try it tonight.