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I have two sets of materials for checkerboarding 701 slats. Both are 10'8" strips with ~110 mm squares.
The first is yellow squares with adhesive backing. The 2nd is 3M CLEAR vinyl printed with orange-red 110mm squares. This material has upper and lower clear boarders of approximately 1.5" that can wrap around the back surfaces of the slats or can be trimmed off.
I decided to shelve the yellow mat since it required painting (one of my lesser skills), so I managed to acquire 3 yds of the clear 3M car wrap vinyl but could not find a suitable orange printable ink match (hence the Too Red Orange).
I have ~ $175 invested, but will accept $110 and I will pay the USPS ...