3 questions on painting concrete and metal

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Q. I have three questions about paint. In your Oct. 26, 1979, column you recommended three ways to paint a concrete porch: Concrete primer-sealer, fiber-glass and resin, and concrete stain. Which of the three do you suggest I use on my concrete porch?

* My 23-year-old metal garage door needs repainting continually. What should I use on the door to reduce the frequency?

* My new aluminum railing was sprayed with two coats of white paint about a year ago. It now is full or rust spots. Why? Mrs. Jessie Fowler Bradenton, Fla.

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A. In reply to your first question, remove the old paint down to the clean concrete. I'd then apply a concrete stain instead of the other two methods.

* In regard to the metal garage door, first remove any loose and peeling paint by sanding, scraping, wire brushing, etc. Then I would apply a quality metal primer to a firm, thoroughly clean surface so as to obtain proper paint adhesion. Follow with a top coat in the sheen, color, and type of product you wish.

Note: Unaware of why the paint peels, I would defer to a local paint expert who can inspect the door and make his own recommendation.

* As to the aluminum railing, the chances are that the railing is not aluminum at all or it would not rust.Aluminum will not rust. The railing most likely is a ferrous metal which rusts because of an inadequate primer.

To retard the growth of rust short of sandblasting down to the bare metal, apply a full coat of rust-preventative primer to a clean smooth surface. Follow with an oil-based enamel top coat. This process usually is effective in curbing rust, but not always.

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