Forget the lab. I just posted some to paint and they are spot on for the width and lightness. Spills seep through the top layer and "appear" on the bottom layer so it doesn't seem to be holding anything back, but when you touch the backing it's dry. There are no instructions but you can see that one side is soft and absorbent while the other is shiny and repellent. Lay it shiny side down and you're done. This box is a dispenser in case you didn't know. Cut off the required amount with scissors, being careful to use where it will have the most impact (e.g. on carpets or when working with sticky, viscous or dripping substances). It's great for home use but can get pricey so you'll have to be smart about when and where you use it.
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