Recommended:
(1) Tub Savers Plus. Doug Collins 724-415-7065. http://tubsaversplus.com/
(2) Dream Maker Bath (formerly Gnu Tub) 412-855-4440. They are located on Saw Mill Run Blvd. http://www.dreammaker-remodel.com/franchise/pittsburgh/
(3) Avalon Tub & Tile. http://avalontub.com/
(4) American tub & tile reglazing systems 412 628 8827 http://americantubreglazing.com/
Cautioned against:
(1) AAA (multiple people strongly advised against this company)
(2) Permatub (out of Wexford)