I need to make a fake 'beer foam'?

Question

We are participating in a themed Oktoberfest - fundraising event. We have the costumes but looking to have plastic beer stiens have the look of beer without the weight and disaster of spilling. Just for show.

The 'fake foam' look would be great

Answer 1

Great Stuff, the crack filler stuff that is expanding foam. Put your whatever in the glass to look like beer then put the Great Stuff over it and let it bubble up so it looks like beer foam. Might need to do some creative painting on it but might not.

The Great Stuff is very very light weight, dries fast, but would be permanent in your plastic glasses.

Answer 2

I had to do that for a few stage productions... I simply took the plastic mugs, sprayed the inside (less 1" at top, masked off) with a yellow acrylic paint that is semi translucent.  I then used straight expanded styrofoam carved to the correct shape.

I used an ACRYLIC gloss medium to give the foam a hint of shine... it won't melt the foam.

I had six trays with 10-15 steins each.  I had 2 of the trays with the steins hot-glued in place for dancing.... That was for "HELLO DOLLY"