Step One
Lightly sand entire window with 120 grit sandpaper or sanding sponge, being careful not to sand the glass. Clean window sashes and trim with a mild detergent solution, rinse with a damp cloth and clear water. Allow window to completly dry.

Step Two
Dust off entire widow with a dry brush.Do not tape off the glass, it is more trouble than it is worth.A single edged razor blade can be used to remove paint from the glass after the paint has dried.

How to paint a window
A double hung sash window consists of two moveable sashes, one upper and one lower. The wood strips that hold the window panes are called mullions.

Some new type sash windows have removable "false mullions" often called mullion grills or grids.

Step Three
Rotate the sashes by raising the lower sash up as far as it will go and pulling the top sash down as far as it will go. Paint all that you can access of the lowered top sash. note that underneath the bottom of this sash should already be painted with the exterior paint.

Step Four
Raise the sash back into position stopping a few inches from the top.Finish painting the upper part of this sash.

Step Five
Paint the lower sash. Start painting from the inside and work outward

Step Six
Complete the window by painting the woodwork trim. Paint the inside edges (jambs) first, then the outside edges, next paint the face of the woodwork. Paint the window sill last.

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