I like Obenaufs.It has a brush applicator.I apply some to a bolster then use my hand to rub in and spread evenly.Let it sit for an hour or so then wipe off excess.Wait a week in between treatment.After the 3rd round the seats will be coming back and are getting soft and supple.It takes a month and 4 treatments to get them back.I do the seats every 6 months after that.
