Deluxe Professional Oil Primed Linen Canvas Panels - 12x12-3 Pack of Linen Canvases for Painting, Artwork and More

Is this made of cotton or flax?

Are oil pastels comparable to this product?

Does this canvas help oil paint glide on smoothly? I'm a newbie and the current canvas is linen and it's giving me problems.

Are these mdf boards peoduced with formaldehyde ? I am asking because of concerns with voc and also longenvity