Message text written by "BP - Dwell time 5 minutes." >What is thixotropic resin mortar? ][<en< Mortar: A mixture of binder and aggregates, usually graded sands Resin: A polymer or prepolymer; in this context probably epoxy, but possibly polyester or MMA (methyl methacrylate) Thixotropic: As opposed to viscosity, which is roughly definable as "thickness" in respect to fluid flow characteristics, thixotropy describes "thickness" in respect to resistance to beginning flow from a stationary state. Basically, you can assume that this spec is calling for something like a non-sag epoxy mortar. Mike Edison