Adhesive putty and double-sided material are for holding a part temporarily, never for a permanent bond. They park a small component on a cocktail stick before it is sprayed, keep a brass part in position during a dry fit, or steady a model on its base while you decide how it should finally sit. The category includes very thin double-sided tape that can be cut to any format and leaves no bulk under the part it holds.
Thin double-sided tape has two jobs on a bench. The first is as a painting handle: a part stuck to a stick or peg can be turned while it is sprayed and never touched, which works alongside stands and clips. The second is the dry fit — tack the part on, judge the fit and the angle, and only then reach for adhesive. Cut the tape exactly to size with a sharp blade from cutting tools. One warning about fresh paint: apply any temporary hold only to a thoroughly cured surface, or it will lift the finish when it comes off.
