I lean towards buying the blocks, but the heavier the weight the more you can soak it up before it crinkles. Illustration board is normally quite heavy, so no worries there.
I usually apply gesso to the underside of illustration board so it won't warp so much.. and I got some plywood so I can pre-stretch watercolour paper if I need to. I'd hate to ruin the pretty edges of Arches by doing that, though.. so I'll try to get a heavier paper if at all possible. Thanks again!
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