
I love Arches paper and especially their watercolor pads. They are in fact sealed on all sides (except for the little ones where you insert a spatula to separate the sides). I've used other blocks that separated immediately and it was annoying; I buy blocks for a reason and if they separate before you use them you can buy separate sheets too. The paper has a consistent even "tooth" and holds watercolors perfectly and also gives you time to work with the paint as needed for blending/blobbing etc.

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