Easy to cut: A corrugated plastic sheets made from polypropylene are resistant to moisture and water.

Do not react to chemicals and acid.Toughness, resistance to tearing. And for better flexibility,Lightweight,durable and resistant impack well.

Great solution for write, print and message directly on to the sign board.

Multiple purpose outdoor sign, No problem work with yard sign stakes, A-Frame, advertise or sign post.

DIY: Coroplast for guinea pig case.

How sturdy would these be to use as a lap board for painting? Would it bend too easily if there is no other support?

This board is very sturdy if you cut it properly for your desired use. I can imagine your design would be “oval” in shape and if the board is cut with the membrane running longways then it should work. However if the membrane is cut to run the length of the shortest width then it would probably fail. Paintbrush to paint for non-commercial artist I would imagine should be strong enough.