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Use a heavy pressure on those. When larger hardboard heats up, it wants to buckle as it heats. A heavy pressure keeps it flat. If you are used to doing smaller pieces, you will want to increase you time a bit, as it has more mass to heat up. Third, cool it flat with something heavy on top. Like when it heats up, when it cools it will want to buckle a bit. Keeping if flat while it cools will ensure it will be flat when it finishes cooling.

They are pretty easy to do, and the coating is very durable.
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