I have used Monokote for well over 30 yrs ,the white was always a issue with me ,it started out as a good opaque product that would cover over other colors without bleeding thru ,then went to almost transparent when the wood even showed thru.Now its thicker and more opaque again but its harder to shrink a person needs to take there time and do parts a little at a time or a burn hole will happen. I just finished a 51 using Platinum since I hate the Alum .This has the same probs as the white does very hard to shrink.
I have used Ultra coat or oracover and in some cases it will go on easier ,but whack it one with the heat gun and it will pull off the plane .or let it set out in the sun for a while .Looks like a prune from all the wrinkles ,I'll keep using monokote even though it has changed in time but what hasnt .