Think about how shelf brackets hook into the slat wall slot, only
being supported by what amounts to a 1/4" of MDF. More than once
I've seen that upper "lip" of slat wall rip out, dumping product
all over the floor and customers, at a local department store
when a shelf was overloaded and the bracket arm acted like a
lever applying all that force to the lip.
There are several web sites with load-per-bracket by bracket
length out there. I would suggest checking them out to see if
slat wall will really do the job for the "heavy stuff" you plan
to load on those shelves.
And speaking from experience, the 3" slot spacing can be a royal
PITA more often than you'd think.
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