In my case, one of my earliest mosaic mentors was the award-winning ceramist and mosaic rock star Eric Rattan. In an effort to teach proper tile setting skills to the next generation of artists, Eric created “hard hat workshops,” during which he taught us invaluable trade skills - like how to measure a room for square, and how not to embarrass yourself by calling a trowel a “spatula.” Break that rule, and you were called a “fruit salad” for the duration.
One of his memorable tips was to always carry a can of hairspray and a tube of lipstick in your tool box. Fashion emergencies aside, he used the hairspray to fix a chalk line in place, and the lipstick to mark protrusions such as j boxes and these here sleeves for the recessed lights. Coat the object with lipstick, then place the intended surface against it. Viola! You have your marks as to where you should cut.
The Neolith wasn’t pre-drilled, because we weren’t sure the sleeves had been installed symmetrically. We had to create an exact template on site, with almost no tolerance for error. I ran to CVS across the street and selected the cheapest, reddest lipstick I could find. It worked! We were able to create an exact template of the two center Neolith sections, mark the 7 light sleeve locations on the vinyl, core drill them and slide the slabs right over the sleeves (with a little bit of extra grinding).
I miss our dearly departed Eric Rattan, as generous with his knowledge as with his friendship. Read all about him here.