The visibility of a laser depends on the light absorbed or reflected by the surface you are projecting on.
Rule of thumb: The more light is absorbed, the more laser power you need.
Transparent or translucent materials, e.g. glass, don’t reflect much light. It can be very difficult to see laser lines projected onto these materials, if they are visible at all. Matte black surfaces absorb a lot of light and reflect little. Here you need a lot of laser power to get a visible spot, crosshair or line. Wet, dusty or greasy surfaces have varying reflectivity. Results can only be found by testing. Rougher surfaces like the bark of a tree or milled grooves may swallow a point and only show many small sections of a line.
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