Here are a few tips to laying your underlay under your rug quickly and easily.
If your rug is to be laid on a fitted carpet please use "Foxi" underlay - the white side goes to the floor and the printed side goes to the back of the rug.
If your rug is to be laid on a hard wooden floor please use "Supergrip" underlay - both sides are the same.
If you have purchased underlay to prevent dye transfer then you should try and trim as close to the edge as possible.