I'm building a large deck and I've decided to use pressure treated lumber for the substructure. For the decking I have investigated redwood, cedar and mahogany. I can't and definite answers on the insect and decay resistance characteristics of mahogany. Lumber yards that sell it say real helpful things like "it should outlast you." Doesn't anyone know how it stands up to weather and insects? What kind of annual care does it require? I'm planning to pre-drill it and use stainless steel screws. Is there a source for mahogany plugs for the holes afterwards? Any suggestion or leads to a source of information would be appreciatedl.