Start out with two russet potatos. Cook in a 375° oven about two hours. Remove from oven, let cool for about five minutes. Cut into 1" pieces. Place into food processor, along with a pat of butter and a dollop of sour cream. Run food processor until potatos are smooth, about 10-15 seconds. Use plaster trowel to remove from food processor. Spread on surface needing adhesive or, very optionally, eat.
Do not ask me how I came to know this formula for glue.