Pull the edge of the carpet back 1 to 2 feet so you can see the underlying subfloor which may be concrete or plywood.
Edge finish carpet.
The stuff mentioned above is for fabric the fray check and stop thread i don t think it will hold up if it gets wet.
Place the cloth along the edge on top of the pile so the edge of the pile and the edge of the cloth are together.
Check straightness of the remnant edge with the measuring tape and marker marking on the back side of the rug any areas that need to be trimmed with scissors.
If you are using the staple gun plate idea you would put your metal plate under the carpet and staple down the edge.
Just place a bead along the edge where it is fraying.
Cut any protruding edges straight or to the shape you want your rug.
Place your carpet face down on your work surface.
Start from the back side applying the tape where the carpet edge meets the finishing raw carpet edges.
Step 3 measure the width of the doorway using a tape measure and then cut a carpet tack strip to the same width using tin snips.
Vacuum the subfloor to remove all dirt and grit.
I would say glue hot glue or a marine glue.
With this method you are going to need to use your knee kicker in order to make sure that the edge of the carpet has a good stretch on it.
Staple along the edge.
This is done by a carpet binding machine.
Binding is typically the easiest and least expensive method of finishing a carpet edge.
One of the methods that you can use to finish off the edge of a piece of carpet is to simply attach it to a tack strip.