We plan to ask a painter to paint parking space numbers in the parking lot (12" x 9").
There is on Amazon a kit for pavement stencils that has good reviews - is there a reason to prefer the 1/4" size (which is more expensive)?
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I'd suggest asking your painter. They might have a preference, and you might save money overall by following their preference, if they have one. Cheap materials that waste paid professionals time can be VERY expensive...or they might already own a set of number stencils, or know where to borrow/rent a set inexpensively.
Depending on materials, the thicker ones might stay put better and save you money overall if the painter does not have to spend lots of time fussing with a thin stencil that does not want to stay put, blows in the wind, etc.
This is more likely if it's a flexible/rubbery/plastic material.
Then again, it might just be a durability issue (how many uses you'd expect to get from them) and make no difference for limited use.
This is more likely for a stiff/rigid stencil material.