The MonoKote that comes in roles is very difficult to get perfectly flat after shrinkage.
You must apply it after putting in the weights, except for the Puma wheel weights.
In other words, shape the car's body, put in the internal weights, Then cut a piece of MonoKote that is at least 4 inches wider than the car body (both from the sides and the rear and front ends).
Be sure to use the kind of heat iron that the model airplane guys use. It is shaped like a boat, about 2/5 inches long and 1.5 inches wide, with rounded edges on all sides, and the front point of the boat has a 3/4" slant upwards. Go to an airplane shop and look at it.
without this heating tool, other irons or air dryers don't work.
I like the MonoKote most because it is the lightest. I hate most because it is so hard to get out the wrinkles.
Many times I have to tear off what I applied, and start again, sometimes 3 or 4 times.
However because of all the difficulties getting the wrinkles out, I seldom use it any more, but it is beautiful when you get it applied correctly.
The best and easiest to apply is EconoKote (however it sometimes comes under the name of MonoKote also). It comes in sheets with backing, so when you remove the backing, the result is sticky on one side.
Very easy to apply. You can even cut the exact shape out, stick it on and iron it on. It is very easy to apply with no wrinkles. But when you apply it, and as you iron it on, you must iron from the center out towards the sides and back. That is so there are no air bubbles. If I miss, and get an air bubble, you can also use a pin prick on the bubble and still iron it out flawlessly.
http://www.monokote.com/econokote.html
You can buy from this site directly, or go to the tab showing dealers by Zip code.
PM me if you want more information. However I will be out of the country during the last 3 weeks of September. That leaves this week only, or in October before I can reply.