Thanks for the feedback. Well I mixed up a small test batch being carful to have exactly a 5:1 ratio. It cured just fine as always. How I am wondering where my ratio went wrong. Did I have too much or too little of the hardener? If the wrong ratio causes it to become rubbery; than the wrong ratio the other way should cause if to become brittle. I think.
Hay Bob do you use oil base or water base urethane?
Bob