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I have a convex soffit that is skinned with 1/4" plywood. The surface of the plywood is reasonably smooth but it does need some sort of covering or coating to make a suitable substrate for a paint finish. My original plan was to curve drywall to fit but I am wondering what other options I may not have given due consideration.

I have done a good bit of DIY drywall and am comfortable with mudding, etc. Would it be practical to prime the plywood and put a skim coat of mud over it? Are there any spray-on options that would leave a smooth finish? What do I do about a "corner" bead? I have seen products for curves but it seems they are intended for concave applications, not convex where the bead is curving back in towards itself.

Your suggestions are appreciated.


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