Tail Dragger,
I do not recommend using the Plasticgage dry.
The following is copied from the "Builders Guide" found at
www.modelaengine.com
We recommend that main and connecting rod bearing clearances be verified to be .002 inch with oiled Plasticgage (SPG-1, range .001 to .003 inch). Oil prevents the deformed Plastigage from sticking to the journal or bearing shell.
If you want to speak with me on the phone, ask John Lampl for my number or send a private message.
Terry Burtz