Apologetics Timeout: Did St. Paul Subscribe to Sola Scriptura?

Absolutely not. In Acts 20:35, for example, St. Paul directly attibutes a quote to Jesus ("It is a more blessed thing to give, rather than to receive") that is nowhere to be found in the four written Gospels. Coupled with the fact that St. Paul in this verse was reminding his audience of this quote, it seems pretty clear that the true and one Church of Christ was as reliant on Tradition as it was, and still is, on the written Scriptures.