Hey Chris,
Thanks for the response. I have thought seriously about using PVCX myself, but like you, I just wonder whether it is worth it. The best thing about a plastic rack (IMHO) would be the difference in weight from all of these other materials.
As for which is my favorite - hmm... I don't think I have built my favorite yet, to tell the truth! LOL For this last rack, I wanted to go with either 3/4" birch plywood (like I used for the shoebox rack), or 3/4" melamine - but had to settle for MDF, due to a few things.
The birch plywood I found was all warped, and I cannot find the 24" x 48" or even 48" x 96" panels of melamine any more - only 12" and 15" "shelves". Also, concerning birch plywood; I wish I had used something else for the shoebox rack, as I have found that even with polyurethaning, the shelves have done a bit of warping. Having said that though, I really like the look of polyurethaned birch plywood, and it goes really well with our floor. LOL
I actually think that the latest rack is probably my best so far, and only regret using shelf-liner rather than polyurethane. But - I really hate painting, and I am too impatient when building a rack, for waiting for coats to dry, sanding, etc... My skills are improving though, and if I could have made this rack out of melamine, it would have been just about perfect IMHO. I just bought some 5/8" x 12" melamine shelves, to build a rack for 9.5 cup Ziploc tubs. Pics as soon as I get around to putting it together.
Got any pics of the PVCX rack you built?
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-Toby Brock
Southwestern Center for Herpetological Research