Vinyl Repair Question

2doorBu

Frequent Racer
I have a dash that develop a few small splits and I was going to repair it. I picked up the SEM vinyl repair and the grain pads. I am wondering what material to use to slip under the vinyl to apply the product to so it isn't absorbed into the foam? I am not worried about the color since I just had the color matched to redye the whole dash. and the dash is currently out of the vehicle.
 

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