Stop warping your Perler Bead pegboards by using the Perler Bead tape method. It's also one of the secrets to ironing large Perler Bead designs.
Perler Stamp for Tape Method (updated) : 7 Steps (with Pictures) - Instructables
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Step #8: The Tape Method — Perle Up & Die
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The Tape Method for Fusing Large Projects
Aha! I have found out how to flatten warped peg boards! : r/beadsprites
Step #8: The Tape Method — Perle Up & Die
The Tape Method for Fusing Large Projects