Best product for light barrier/gobe

I was just wondering what products you guys use to make light barriers (or go between) to avoid light spill. I see that some guys use thick foam and paint it black but i don't know if there is any other product that people use.

if i go with the foam, where do you guys gt it? a Cold room manufacturer? How to you fix a stand to it, i imagine that it will crumble if you try to fix something hard like a bracket or stand to it.

I could make one from thin wood but i'd prefer to keep wood away from the electricals and it would hurt more if it falls on the model.

Your thoughts?

I believe you're describing "foam core." It can usually be found at art supply stores and sometimes at large hardware outlets (like Home Depot or Lowes). It's usually best for in-studio use as it will either fly away or bend/break out in the field.

For location work the professional photography solution is called a flag or cutter. It's a metal frame with a black fabric stretched around it. Usually Duvetyne. They vary in size. You mount it with a grip head on a c-stand.

Other ways of controlling spill are Grids, Louvres & Barn Doors mounted on the light source.

I'd do a web search for foam core or gater board (thicker material) and you might find the Australian equivalent. As mentioned, these are art supplies. These products are foam sandwiched between heavy paper or card stock. They are pretty sturdy, actually. You can get this type of product with white or black faces or one side white and the other side black - no need to paint. As with any product that is light weight and large, wind can be a problem. Bending is a much bigger issue than breaking, but the real problem is just taking off in the wind like big piece of paper-faced foam and tipping over everything that is attached to it or in its path.