I just thought I could share this idea with you. I noticed when making curved or rounded sections in my models, there was a tendancy for the paper to 'spring or distort' from the true shape, due to the paper trying to retain its original flat texture. What I have found (and works well) is a covering of..... superglue (cyanoacrylate). Basically when a curved piece is made, (eg, a lorry mudguard) arrange the piece in its final shape with masking tape. Paint on the superglue with a cheap disposabe brush and spray with accellerator. (Accellerator makes glue set immediatly) remove tape and presto ... the shape doesnt spring back. Its now got a thin plastic layer on in and its waterproof. Can be painted, varnished and even SANDED! I get the glue at my local cheapo store and accellerator from the well known internet auction site .