A cap collected some of the oil spewing out of the blown-out Gulf well, but black crude was still leaking into the sea, and officials said they wonít know until later Friday how the device is working. Itís the latest bid to contain Ė not plug Ė the nationís worst spill. Even if the cap is successful, it will not collect all the oil coming out. Stopping the leak is still months away. Meanwhile, waves of gooey tar blobs were washing ashore on the white sand of the Florida Panhandle and nearby Alabama beaches as a slick from the spill moved closer to shore. Spotters who had been seeing a few tar balls in recent days found a substantially larger number before dawn on the beaches of the Gulf Islands National Seashore and nearby areas, a county emergency official said. The park is a long string of connected barrier islands near Pensacola. Oil drips from a glove dipped into the water during a tour by Louisiana Gov. Bobby Jindal of an area impacted by the Deepwater Horizon oil spill at Pass a Loutre, La. Wednesday, June 2, 2010. A brown pelican coated in heavy oil wallows in the surf June 4, 2010 on East Grand Terre Island, Louisiana. Oil from the Deepwater Horizon incident is coming ashore in large volumes across southern Louisiana coastal areas. A brown pelican coated in heavy oil tries to take flight June 4, 2010 on East Grand Terre Island, Louisiana. Oil from the Deepwater Horizon incident is coming ashore in large volumes across southern Louisiana coastal areas.