Applying this once in awhile to the cork on your Birkenstocks will keep them looking as good as new for YEARS! ~~~ Brush it on, let them dry for 20 minutes; you're good for 6 months (or whenever the cork becomes dull again). This jar lasts forever. And comparing this sealer to what Birkenstock sells under their own label for more money? I think Birkenstock buys this brand and re-labels it with the Birkenstock name.