Yes, it can.
You could but I would not advise that you use 208R for that purpose. 208R is a patching sealant for small holes on a roof. Depending on where you live there are several Henry products in stock at the Home Depot in your area. One of them is 101 Non-Fibered Foundation Coating. This is a solvent based foundation coating that can be used in temps down to 40 degrees. However, if you are in California it is not available. It can probably be special ordered if not in a store near you. Another great product is 107 Asphalt Emulsion which is a water based sealer and dampprofer available in just about every Home Depot. Another however, this product must have temperatures above 50 degrees continuously for at least 48 hours to cure. Thank you for putting your trust I the Henry Co. and Home Depot.
No, remove any loose material before application.
Not unusual and very possible. Where water gets in, so does air, air circulation and the sealant will want to go the path of least resistance just like the water did. It will take 6-8 weeks for the sealant to completely cure hard, In the mean time it will off put gases
That should work.
Not for large cracks. This product is made for roof repair. This sealant is not designed to withhold any head pressure. I would not recommend this product for the repair you are pursuing.
Yes, will take 6 to 8 weeks to dry completely hard. Do not drive on sealant till hard.
Pinholes, Yes. White, no.
Jesjonesy-no. For that we would recommend the 900 Construction and Flashing Sealant. Thank you for putting your trust in the Henry Company and The Home Depot.
Product is not made as an adherent for metal surfaces, Other metal leak preventive products are available.