There are several types that will work. The best can be purchased from a construction specialties supplier. It will come as a 2-part system that has a latex bonding additive that you use in place of water. It will make the concrete more pliable and less susceptible to cracking. What type of reinforcement (fiber, wire, etc.) are you planning on using in the concrete?

Glenn

Thanks, Glenn. Ironically enough, I just saw Acrylic Concrete Fortifier at a store today and considered using it to create a smoother, more supple, and water resistant finish. Is that what you were referring to? What is the two-step processto which you referred? How can you pour concrete in two steps? Or is it a two-step mixing process before pouring?

I had considered using the rolled up wire sheets for support, but on the advice of a friend I was considering using 1/8 inch rebar: it will be easier to just cut the rebar to length as needed and lay it out in a grid. I want it to be the minimum thickness possible, so I want to use the thinner rebar. Plus, it's not going to hold a lot of weight during use.

I was not referring to a 2-step process. What I said was a 2-part system, which includes both the dry concrete mix and the liquid latex (or acrylic) fortifier/bonding agent. These components are mixed together without the addition of water to make the concrete.

The #1 rebar you are talking about using should work well. Be sure the bars are lifted or supported off the form to insure the concrete gets all the way around the bars. I would recommend a 3” – 4” on center grid pattern. I would also recommend you bend one continuous bar around the outer perimeter approx. 1” – 1 ½” from the edge form to keep the corners from cracking.

Glenn