rderzapf

I am planning a vinyl-liner pool build. It will be a concrete formed wall pool with outside concrete steps. I do not like the plastic steps and want to form outside concrete steps and plaster them. I would like to form a "U" shaped gasket/track seal around the steps as you do with the plastic kit steps. I am planning to use Trex screwed to the inside of the form wall in the "U" shaped pattern prior to the concrete pour so you will have a sealed solid surface to screw to and to place the gasket and track for the liner. I cannot find the Track sold by itself. Is there a builder that has done something similar and could tell me if this is a plausible idea and where to obtain the track. Thank you,