may also be achieved by dispensing disconnected beads lenses ribbons or dots of precursor composition which knit together during cure to form a continuous body of gel composition a combination of dispensing and stencil printing may be employed to control final material size area and thickness the preferred embodiment is a two part compound containing the parts as follows optional coloring pigments are preferably used to color one of the a or b sides preferably iron oxide such as available as kroma red from harcros pigments inc is included the a side using a double planetary mixer the a side is prepared by mixing the components from table a 1 adding 1 2 3 4 and 5 to a ross u00ae planetary mixer and mixed for 5 10 min 2 adding 6 and u2153 of 7 and 8 to the mix and mixing for 10 15 min at 30 rpm 3 adding u2153 of 7 and 8 to ross mix 10 15 min at 30 rpm 4 add final u2153 of 7 and 8 to ross mix 30 35 min at 30 rpm 5 add 9 mix 3 5 min to wet out stop mixer scrape blades using a double planetary mixer the b side is prepared by mixing the components from table b 1 adding 1 2 3 and 4 to ross mix 5 10 min 2 add u2153 of 5 and 6 to ross mix 10 15 min at 30 rpm 3 add u2153 of 5 and 6 to ross mix 10 15 min at 30 rpm 4 add final u2153 of 5 and 6 to ross mix.