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Electrical Plates Covers
Size up a piece of wallpaper over the switch plate opening to match the pattern up.  Rough cut this piece to the size of the opening + two inches or so.

Glue the piece with VOV (vinyl on vinyl) or border adhesive paste.

Put the plate on the wall without screwing it in.  Match up the pattern again of the piece of wallpaper to the wall first then overlay it onto the top portion of the cover plate. Without disturbing the placement remove the plate and press the wallpaper all the way down on the whole plate. Wipe any glue from off the wall with a damp sponge.
Relief cuts
When the strip of wallpaper runs into a door casing or window, you will have make a relief cut on the corners where the wallpaper overlaps a door casing or window etc….

To make a relief cut bring the strip right to the door casing  without overlapping it.  The wallpaper will be creased at the edge of the door / window casing.  At the top corner of the casing put a short cut right at the point of the casing where it meets the wall.  Pull the wallpaper out from the casing and cut with your scissors on a 45 degree angle up to the small cut from the end of the strip.  Do the same at the bottom (as in a window casing) but you will cut down on a 45 degree angle to the small cut at the bottom corner of the casing.  Once the relief cuts are made you can smooth the paper down and trim off the overlap at the side of the casing. 

Hanging around a door or window
Going into the casing you will make your relief cuts as described above.  Proceeding through the opening with the next strip.

Coming out of the opening you will put down a plumb line slightly wider than the strip of wallpaper.  You will use this as a guide to maintain the plumb and level of the wallpaper.  Make your relief cuts as you did going into the casing.


















Now the difference with windows comes with the first full strip coming out of the window opening because you must match pattern above the window and pattern below the window.  On a long window you may get a difference in widths on the top and bottom if  you stretched the wallpaper a bit smoothing it out.  On a small one-strip-in-the-middle window you shouldn't run into that problem. 

You will measure out from the top of the window strip the width of your wallpaper and make a plumb line down the whole wall.  Then measure from that line to the edge of the bottom of the window strip.  If the measurement is exactly  the same you will hang the next strip from that plumb line back into the window.  If the bottom is slightly shorter , make another plumb line - the width of the wallpaper from the bottom edge and use this to hang the next strip back into the window. You will have a slight overlap (in this case) on the top edge, which will require you to double cut that seam.

Double Cutting
Double cutting is the term given to the cutting through two layers of overlapping wallpaper.  To execute a good double cut seam  you will smooth down the wallpaper overlapping at the seam.  Take a straight edge and cut between the overlapped section .  Pull off the “underlap” piece and smooth the paper back down. Clean off the paper with your sponge and clean water.  Use a new razor on double cuts to be sure of a clean cut through both strips.
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Windows
Windows are a little harder than door casings because you have a strip on the top over the window and a strip on the bottom under the window (this bottom strip you don’t have with a door). The level line at the top of the wall (see How to Hang Wallpaper Plumb and Level) will guide your pattern at the top.  You will have to make a level line under the window to guide the pattern  (and maintain level) under the window.
How to Hang Wallpaper
An Overview
part 3
Hanging around a window demo.
Please view this video for demonstration of wallpaper installation
The "Kill" Point
Where the wallpaper ends and meets up with the start point you will have a mis-match.  This point is called the "kill point". 
You can "fudge" the kill point by adding pattern back into the seam to make it look like a match. The main reason for starting over a door rather than to the corner next to the door is to make this kill point as small as possible.  If over a door you may have three feet of seam to "fudge" into a convincing "match" by adding pattern back into the seam.
How do you add pattern back?
You add pattern by cutting out pattern with your sissor in a creative way (you are "fudging" this) to make it appear as though there is no mis-match.
Attach the pattern to the wallpaper with VOV (vinyl on vinyl) paste. When done creatively you can hardly tell that there was a mismatch at all.
Practice this off the wall on a piece of illustration board or drywall.  Put two seams together and then cut out pattern from a scrap piece and glue it down (with VOV) , work on this until you get the hang of it.
Place the plate face down on your table and trim the excess (leave 1/2 overlap to wrap around to the backside of the plate).

Cut the corners diagnally on a 45 degree angle, then wrap the paper around to the back of the plate. 

Locate the screw holes and cut an "x" in the middle of the holes, then push the pointed end of a pencil through the cuts to create a round opened hole.
Wallpapering over switch plate demo
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