Stan`s yellow tape was specially developed to seal the rim bed perfectly. 10yd is enough for four 29er rims.
The tape is airtight, non-porous, super thin, has no effect on tire fit and leaves no messy residue when it needs to be replaced. If you ride with less than 45 psi / 3.1 bar tire pressure, a single wrap of tape is required, if you ride with more than 45 psi, a double wrap of rim tape is required.