Black jack, 3.6 qt, fibered roof coating, penetrates, resaturates & protects dried out & exposed roofing felt, can also be used on metal roofs & siding, exterior foundation walls & all other concrete & masonry surfaces, easy to use, does not run or sag, do not use on shingle roofs, for exterior use only, roof should be clean & dry before application, approximately 35 sqft per gallon, clean up with mineral spirits, allow 48 hours before backfilling.