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If you want to learn how to 1st coat butt joints go here How to 1st coat butt joints

   (What's A Butt Joint??)

Butt Joints happen any place two ends butt up against each other. Unlike the tapered edges on the top and bottom of sheetrock, butt joints are just flat (There is no cavity to fill with mud). If you were to take a wide knife, and place it on a butt joint, you will see that not only is it flat but many times you will be able to rock the knife because it is a little humped already. What you are trying to do is build up the mud on each side of the tape to make the joint as flat as possible. You don't want to make a bigger hump. See what I mean??


The picture below shows what we are trying to do here. 1st coat (Yellow) we will use a 10 inch knife. Build up each side of the joint. The 2nd coat (Blue) we will use a 12 inch knife, coat the middle of joint.


Step 1: Sand

Using a sanding pole and some 80 to 120 grit sand paper lightly go through your project and sand any edges and lap marks. You shouldn't have to sand too much here. All you want to do is knock off any edges from the 1st coat so there won't be any problems with the 2nd coat.

I like the new round sander made by (Full Circle International)

Not only does it remove more material faster, It really makes your joints flat.

A regular square sander might make a butt joint smooth but it will leave it humped.

A medium sanding sponge works great for your angles, corners and detail work.



Step 2: Mix Mud

Mix up your mud. To learn all about mud and how to mix go here All about Joint Compound

Thin your mud down with a little water. Mud straight out of the bucket is too thick for anything. Any pro will tell you that you must thin it down. You want it smooth and spreadable like pudding. Once you have some good mud mixed up and ready to go, get a little bit into your drywall pan. For the 2nd coat you will need a 12 inch knife. Always keep your pointer finger in the center of the knife, this will give you more control. Always try to keep the finger side of the knife as dry and clean as possible. Most knives have a logo or something on the handle on one side. I always make the logo side my finger side. Decide what side you want your finger side to be and stick to it. If you're flipping the knife all the time it will get all wet, dirty and sloppy and gross. You want your pointer finger to stay dry.




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