Solvite 1574677 Overlap & Border, Ready to Use Wallpaper Paste for Hanging Borders & Overlapping Seams, Strong Glue, Easy-to-Use Wallpaper Glue for Quick Wallpaper Repairs, 1x240g

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Lap one panel over the other, and cut down the middle of the overlap. Angle the knife blade down low so more than just the tip of the blade is doing the cutting.

After you’ve folded a length of paper, roll it. Set each roll in front of the wall where it’s going to be hung.When starting from an inside corner, allow at least 1/8 in. overlap on wallpaper from the adjacent wall. This lets you hang the paper plumb, regardless of how plumb the corner is.

Don’t assume the corner you’re starting in is plumb. Use a level and draw a straight plumb line about 1/4 in. past where you want the first panel of paper to end. Take into account that inside corner seams need to be overlapped at least 1/8 in. For more information, see “Seam Inside Corners” below.

The blade option is ok too but be carefull not to go too far beyond the paper into wall ,emuslon, this could make the underlying paint film split and oen the paper up worsey.