The best replacement for urethane is polyurethane.

The best alternatives to urethane are rated as following:
★★★★★  polyurethane
★★★★  fiberglass
★★  varnish
★★  epoxy
★★  enamel
★★  enamel auto paint
★★  rubber bushings
★★  lacquer
★★  epoxy primer
★★  rubber
★  enamel paint
★  acrylic enamel
★  polyurethane finish
★  acrylic paint
★  polyurethane paint
★  varathane
  fiberglass body kit
  reactive resin
  acrylic clear coat
  base clear
  enamel car paint
  polyurethane floor finish
  oil polyurethane
  icynene
  carbon fiber
  polyurethane paints
  polystyrene
  acrylic urethane
  fiberglass body kits
  lacquer primer
  shellac
  spar varnish
  polyurethane varnish

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Google Trends

Scale is based on the average worldwide traffic of urethane in all years. Click on graph for more.
urethane
polyurethane
fiberglass