Guardian is actually a very soft material, bowling-wise. So the oil in the heads tends to disappear and, lucky for us users of it, tends to re-appear down at the breakpoint area. Oh, Joy!
Typically, Guardian overlay lanes seem to need to largest adjustment during the 3 games of league. A normal range used to be about 12 - 15 boards with your feet through those 3 games. When I bowled on a full 60 feet of Guradian, it was not a very enjoyable experience. Huge adjustments, plus trying to find a way around, through or in front of carrydown.
That said, today, I bowl regularly in a different house which has the fron half covered by Guardian and the read half is "normal" pine. The pine happens to be in very good shape and I think it was just last year that they got a new Guardian to replace the old. There is a huge difference between this house and the old house which had the 60 ft of Guardian. In this one, the oil maintenance chief really knows his oil and is a bowler there. He takes meticulous care of his machines (just got a new Kegel machine in) and we rarely see carrydown and the shot actually holds up, with more normal moves of 3 - 6 boards over 4 game blocks. So I guess the main difference is a single man who cares about bowling. Funny that!
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"None are so blind as those who will not see."
