Peeling textured finish on garage ceiling & walls

Most of the textured finish and tape is peeling from the ceiling and walls of my two-car attached garage. The standard interior drywall was not primed or prepped, nail heads are rusty. My plan is to scrape off the loose texture and sand off the area still adhered, re-tape the joints and apply a coat of paint primer before a finish coat of exterior latex. Any suggestions different from the plan or recommendations for materials?
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JimB wrote:

You will find it easier and less dusty if you spray a small area with warm water before scraping it off. Just use a pump sprayer and a wide taping knife. Cover your hair and eyes because it is messy scraping overhead. Covering the floor with a disposable drop cloth will aid in clean up.
Mudding and taping overhead is a tough job since you have your arms overhead the whole time. Also, imperfections in a taped and painted ceiling tend to draw the eye. those are the reasons a textured surface is used in the first place and why you might want to just re-apply a new texture. It's far less work than taping, mudding, and painting.
it's no big deal to apply texture. You can use a hopper gun and and air compressor to apply a finish called popcorn for example. It is far less trouble than all that other stuff. Of course you know what yu want and for sure a painted surface is less maintenance since it is a hassle to clean or paint a textured ceiling compared to a smooth surface.
lawrence
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JimB wrote:

go here and read up: http://drywallschool.com /
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