Recovered a scratch & dent Topflight P-51 ARF two years ago. Ordered OD and silver Monokote, already had black, white. All worked properly and no wrinkles have appeared during two years of trips to the field.

I have has some metallic colors that were difficult that took extra work but the results were very good. Never thrown away any Monokote.

Monokote requires high heat for proper bonding and shrinking. The small, narrow irons cannot generate enough consistent heat for large areas so they need to be used for tacking edges and molding around corners. A large flat iron (even a WalMart cheapie) works best for large areas of edging and shrinking. Heat guns are fine too for shrinking large areas as long as you cover the edges so the high heat doesn't them pull away, leading to new wrinkles that will never shrink out.

If using the heat gun, use pieces of thin card board (cut up the box the kit/arf came in) as shields over edges or overlaps. Frequently I use wet folded shop cloths on the seams/edges.

I don't doubt some rolls can be defective as any product can be. However I do think technique is the difference between excellent results and failure.