RE: edge seal for monokote
Trim Solvent with a very fine brush, and you can 'paint' it sealed. Thin CA too, as mentioned.
But another thing to think about, is to 'glue down' the edges once the covering is applied. I typically do this with engine compartments. Apply the covering, and allow a little to overhang into the engine compartment (or over the cheeks, wing saddle etc..) Seal down the edge, teh best you can. Then paint it all with Epoxy, like what you would do to 'fuel proof' the compartment. that way, the covering is under the epoxy, and it'll be very hard for it to 'peel off'