I bought a cheap patio set of a table and four chairs for my balcony. The set is made of metal with the seat and table covers, glued with a thin paper with a wood-grain pattern. When it rained, you can guess what it did to the covers. I began to scrape the covers off of everything, leaving a bare metal. Whould I lightly sand the metal and then apply an acryllic exterior paint, both for attractive and rain-proof purposes? What kind of paint should I buy?