This stuff is supposed to be fairly toothy and very transparent.
I read in a google search what Stumblefingers posted, that some people use acrylic matte medium as a clear gesso primer for various surfaces.
I sure hope I can find the brand I used previously it is exactly what I want.
Edit: I found it - Tri-Art Artist Mediums, 1000ml, Clear Gesso - I ordered it from Amazon the summer of 2014.
I just examined some panels that were coated with it several years ago. The color of the hardboard shows through really well though it does darken the surface similar to what you get with any clear coating. Not as toothy as some of the other brands of gesso I have used, but toothy enough. I guess there is some point to saving old emails....
Now what to do with this yucky Art Alternatives clear (milky) gesso that is NOT clear. I guess I can tone it with some pigment for colored grounds.