This tip is to help in matching paint colors when re-touching playfields or
backglasses. Even after mixing paints to get what in the pot looks to be a
good color match, the new paint often ends up being a stark contrast to the
paint around it after drying.
A proper check can be made prior to committing paint to playfield or
backglass using the plastic films used to make photocopies onto
transparencies, or for the outer cover-binding of documents. This material
is thin but quite stiff and totally transparent, so if you paint a sample of
the color on it, once dry you can lay it on the playfield or backglass and
compare it with the surrounding original paint to see if it's a good match.