Glue thickness question

[atthelastminute]

This may be a stupid question, but I didn't find anything covering this previously. I need to join two pieces of 1/4" plywood to make a 5x6 piece. I have cut rabbets in the two edges I want to join and the resulting joint is very smooth, but I am worried that after gluing them the thickness of the dried glue is going to cause a height difference that is small but noticeable to a perfectionist.

Does anyone know how much difference I can expect the glue to make in the joint? How much is acceptable? During setup I used a scrap piece of wood, and when it didn't catch on the edge of the joint I considered it reasonably flush.

Thanks for the help.

[Wood_workur]

Cut one rabbet too deep by about half of the thickness of a sheet of paper if you are that much of a perfectionist. I am a perfectionist, and I really wouldn't see a need to do that. Some sanding will make things perfect.

[vaking]

I would not worry about it. The glue is capable to fill some small cavity but when gluing together two flat surfaces it will not increase the thickness. Glue operates at molecular level, nothing that you can measure with conventional scales. Touch the surface with the sander after you finish.

[scorrpio]

On a proper joint, glue thickness is estremely small - less than .001. Anything thicker than that, and glue joint will be very weak.