Always think about the teeth biting into, not away from, the
If you are using a circular saw:
Finish side down, blade enters the back of the sheet, the teeth
will be coming up into the finish face.
If you are using a jig saw, it will depend on the direction of the
teeth on the blade. Most blades cut on the up stroke, so again,
finish down, blade teeth rising into the finish face. The do also
sell blades with the teeth going down to cut on the down stroke.
These are most often used for Formica cutouts. If you did have
one of those, you would have finish up to allow the teeth to cut
into the finish face.
Routers and zip tools don't care.
If you do use any tool that touches the finish face, make sure you
wrap the shoe with masking tape, scrap carpet, cardboard or some
such. The vibration coupled with an aluminum sole plate or a used
dirty plastic plate will mar the finish.
Keep the whole world singing. . . .
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