No worries Retro, I had to roll it on with a finishing roller and I think it was going off too quick so it created tiny bubbles that could not escape before curing ( moisture cured ). It was perfect temp for application so can only assume it needed to be thinned out a little bit more rather than straight out of the can.
When the next one comes around I will either spray( when I get a spray kit ) it or thin it out a bit as mentioned above so it also self levels better.
No big deal as that is why I am doing this resto for the learning curve  . Am still really stoked with the results though 

Aaah.. Yes a roller will trap air into it and if the clear is even slightly too thick the bubbles wont escape.. a quick rub back and another coat should fix it though.

Spray or even paint brush works well with KBS.. have tried both very succesfully