An enclosure for a portable computing device can include a cover glass affixed to an enclosure without trim pieces disposed between the cover glass and the disclosure. The additional gain factor is related to the ratio of the storage time to the stretched pulse. Each block includes a male and female part for mating the two identical blocks together. A product selected through a screening test process is packaged. Resulting roofing coating asphalt compositions may comprise a paving grade asphalt and a wax, and yet still has desirable penetration, softening point and viscosity.