Estes USS Enterprise #1275, Part 22, Rectangle Detail Prep

Here's the back of the die-cut cardstock piece.

Note the crimping. This side will be glued down.

A before and after sanding with 400 grit on a block.

Any raised edges are rolled over with a burnisher to flatten the top.

The edges get a smoothed bead of glue to seal them.

After the glue dries, sand the sides with 400 grit.