As far as the tile roofs, they last a long time. It isn't the tile that is the issue, it's the felt (or paper) underneath that gets replaced. Mine is 25 years old, has not been replaced yet. Some neighbors have had theirs redone, but many have not as yet. 04-06-2011, 12:00 AM.
Particle Accelerators Could Be Used to Produce Energy (and Plutonium) Particle accelerators, which are not renowned for their real-world applications, could in fact be used to produce energy, according to a 34-year-old research paper that resurfaced this week.
Accelerator (or activator) is a liquid chemical that comes in a spray bottle or aerosol can for use in speeding up the cure time of all CA types. It should be misted on, not sprayed heavily on the joint. The glue will instantly harden. Accelerator may cause exposed CA to bubble and sometimes change color.