hi     monocoat is a bit more shinny-  (   plastic looking )   ultracoat looks more like a paint job-   and will go around compound curves much better    -ex.those big round fusesif having a problem with the heat of the day-making wrinklesput a pin hole or two in each open bay of a wing-   i do like to work with ultra coat  more i think the color of the monocoat you are using seems to effect the way it works-(white harder than black )-the monocoats that have lasted me years without any lifting  are the transparent colors- (  20 years -no lifting  )but only use them on the top side of a wing or you will have a problem seeing the plane clearly in the air -with the light coming thru the wing-the transparents are also lighter -have had my best experience with the transparent monocoats staying put of all coverings i have ever used