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It's not pinhole projector; it is a single term.
In full sun what expose time are we talking about?
Backsplash grout problem when using 1/8-3/16 mortar over 1/16 spacing and pinholes have formed.. Fix
how do you fix pinholes in a backsplash when you grout a 1/16 spacing and use 1/8-3/16 mortar..