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When I built my layout I got tongue and groove foam sheets So they butted up a little nicer too. It helped me keep my layout more straight. It also came in handy at the top of my grades so it didn’t snap the foam and I don’t have a gap in the foam
 

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If you use t&g it’s going to take a little planning because it’s in 4x8 sheets so keep it in mind at least if you’re going to have any form of a grade
 
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