Armond - it isn't a case so much of PT wood as its application.
Is your patio covered? If it is - go ahead and use a solid coating - I personally would use a latex porch and floor enamel. Glidden has a new one at THD that is very good.
If you patio isn't covered - DO NOT PUT A SOLID COATING OF ANY KIND ON IT - PT OR NOT - IT WILL PEEL!
Your best bet for an open patio is a sem-transparent product. CWF makes a good one - Wolman is good too.
Make sure you let the patio set a spell - PT wood is very wet when new........
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