Darryl Keil Last Activity 2026-08-04 7:35 PM
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Michael Oliver

Posts: 1

Joined: 2026-08-04

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Subject : Warped Stack-up
Posted : 2026-08-04 7:35 PM
Post #38101
Ok, created a panel of 4 layers of 1/8 in pieces of poplar, random widths. Used Unibond 800, 15:1 mix. Left in vacuum bag for 4 hrs then removed and clamped on a flat surface for 2 days. Unclamped and the whole panel was warped (bowed).

I am trying to understand what happened? Poplar pieces too thick? Too slow of a mix ratio? Usually use pieces half that thickness without issue.

Thanks, Michael
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