This Primer would be ideal for using over gesso if you are looking for a smooth finish, Karen.
To use it, I thinned with around 30% water (around the consistancy of Elmers glue), and applied, sanding inbetween coats with first 220 sandpaper, and then a light touch of 400 sandpaper; depending on how smooth you want it, you can even really work it and sand it to a mirror finish. When first applying it, it sets up like traditional gesso (brush marks may stay as are), rather than leveling out somewhat like the regular acrylic gessos that I have used (primarily Golden). Subsequent coats over the sanded first coat(s) level out much more smooth, and require less sanding. It really is best for folks that want to work at a smoother surface.
It dries incredibly fast--you can be sanding it within 15 minutes. It makes for very speedy work getting a smooth surface...!
You can get more information from Lascaux's WWW site at:
http://www.lascaux.ch/english/malhilfen/index.html
And here is the American Distributor's (Savior Fair) list of Lascaux dealer state by state:
http://www.savoir-faire.com/html/body_wtb3.html
According to them, out your way Cheap Joes should have it/be able to get it for you...
I got it at Pearl, but have also seen it at the better art stores around here in Los Angeles, all of whom seem to be starting to stock Lascaux's products.
Hope this helps...
Todd