dont have to seal novarossi engines .
i have never once had a problem with a leaky crank case in any novarossi engine , if you feel it necessary then thats fine ,all that i am saying is that i dont do it and havent had to in over 100 engines that i have built and or maintained . just make sure your orings are in good shape and put a little oring safe oil on all of them before you put the engine together
and its all good .
monty
and i am not really for or against using air seal , if you do choose to use air seal i am sure the product peter at TKO is coming out is going to be the goods !!!