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Hello,
Here's my problem. I'm attempting to finish my garage to make it sort of a play room/man room. I had someone with lots of experience help me put the drywall up, but I was left to apply the joint compound by myself, something I've never done before. I did everything correctly when applying the three layers of mud over the joint tape, but what I failed to do was sand properly. After I applied a coat of primer, I realized (when the sunlight hits the walls) was that the mud from each joint protrudes from the wall a bit. The edges are soft, but it kind of looks like small "speed bumps" on the wall, over each joint. It's hard to see in certain light, but when the garage door is open, it's really obvious. My wife says "who cares, it's still just a garage", but it's driving me crazy. I tried sanding it down some more, but it's seems impossible after I applied the primer (almost like it's too slick). Is there anything I can do to make it look better without starting over?
Sorry this was so long, thanks in advance!
 

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problem with drywall

get yourself a 12" drywall knife and feather out the edges of the joints. try not to build up the center, you want the joint to grow to 24 - 36 inches wide when done. once drywall has been primed, sanding down high spots is useless. good luck.
 
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