But who says I've only done one pair?? To think I use to buy this stuff in 45 gallon drums in the '90's. The 5 gallon can was around 400 bucks if I remember right, some 4 years back and buried in the box of my F-in-laws truck box with all his other junk coming back from Florida. Nothing is cheap, the T-9 is $200 Cdn/gallon jug.