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The best finish for wrought iron railings is either a semi-gloss or a gloss sheen, as each offers good durability against rain, wind, heat, cold, and snow. 

While there are some sealants designed to be spray-painted over asbestos to encapsulate it, you still want to make sure it’s a specifically designed product for this purpose—not just run-of-the-mill spray paint. Furthermore, be sure you aren’t inadvertently spraying the asbestos fibers around when you take on this project, and as always, be sure to wear the proper protective gear, including a P-100-rated respirator and a disposable body suit, so as not to inadvertently breathe in or spread asbestos fibers.

With a protective top coat, fiberglass door paint will last two or more years. Sometimes, this life span can be even shorter depending on what elements the door is exposed to. Conditions like heavy rain and snowfall don’t usually cause issues, but high temperatures and direct sunlight can quickly lead to cracking and bubbling. 

Metal is finicky, particularly when exposed to the elements. In other words, you should always prime your metal garage door before laying down paint. Primer not only helps the paint stick to the metal, but it also prevents rust from bleeding through. If you already have some rust and want to avoid it peeking out, cover the spots with a zinc chromate primer.