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To create the mating piece of trim, the angle gauge needs to point to the exact opposite angle from what you used earlier. Make sure the boards are set up exactly as they will be when you put them on the wall, or else you won't get an accurate cut. Use a pencil to mark the angle of the first piece onto the second one as a guideline for the next cut.
The way you cut depends on whether you need to cover an inside corner, which is concave and between connecting walls, or an outside corner, which is convex and juts out from the walls. However, most walls do not form a perfect 90-degree angle, so you will notice gaps in the connection.If you can't get the angle right, fill in the gaps with paintable silicone caulk, then paint over it to hide it. Place the nozzle near the gap you need to fill, then gradually move the it along the gap while holding down the gun's trigger. jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"