Those who have had experience with using melamine, what is your difficulties with sag problems?
I'm working with a carpenter friend of mine and he tells me that theres a definite problem with sag using melamine. Methods to fix this?
We may have to use some support dividers between the tubs to decrease the amount of sag?

The rack is going to be 4ftx4ft. :]

He suggested plywood instead, but I'm worried about splinters and don't know what kind of paint is safe. :[
Thanks everyone.