Jon, did you see this thread on how Sarto did sound proofing on his coupe?
elan-f15/sound-proofing-coupe-t21714.htmlIt looks like he painted the roof area in addition to the interior. On the Quiet Coat website somewhere is a report from a happy Europa owner who did his roof area.
Based on Sarto's experience, I bought 3 gallons of the stuff for my Plus 2. As I had the interior & headlining in place, I used the stuff as an undercoat; had peeling problems on the main floor area probably due to not sufficiently roughing up the smooth fibreglass and residual oil film. Would recommend using it the way Sarto did if the interior is still out; I would expect it to adhere well to the rougher fibreglass surface on the inside of the car. It is still sticking very well on the inside boot floor, the wooden baffle panel behind the fuel tank and the outside wheel wells that were properly prepped.
It is a latex type paint with water cleanup. I used cheap brushes and chucked them after one use as the stuff dries quite quickly and easily builds up to a very thick coating on the brush; think millimeters not mills thickness.
The stuff really works at deadening the sound. You can tell the difference between a coated & uncoated panel when you tap on them.
I still have about 3/4 gallon left and will probably be using in the headliner area when I get around to removing the headliner to improve my terrible install job.
I have a sunroof so there is not a lot of headliner area left in my case and the paint approach is easier than felts.
I bought on-line and they shipped to Canada no problem. Not sure if they have a dealer for the product your side of the pond or something similar.
HTH