If the old glue is on, and the original glue job was good and even, it should stay exactly how it was. If you are not adding any more glue and the old glue still sticks, it should not change anything. If you add booster, the booster adds weight no matter what method of gluing you use. But if you are lazy like me and use something like Vario Clean, where you can take the rubbers off one blade and slap them on a different blade without having to go through the hassle of taking off old glue, or putting new glue on and the glue still grabs and adheres to the backup blade without any other hassle aside from taking the rubber off and slapping it back on the same blade or a different blade, then I am going to do that any time I can.
And darn that saves me a lot of glue. I have already used far more of the Xiom glue since I got it 3 months ago than the Vario Clean. I had a 200 ml bottle of Vario Clean they I got 2.5 years ago and it lasted me over 2 years because I could just take the rubber off and put it right back on without worrying about adding glue or anything like that. With this Xiom glue I got a 500 ml bottle and I have used way more than 200 ml just trying to figure out how to get a good glue job with one set of rubbers.
For me the choice is obvious. And I am actually happy to hear that I am not alone and NextLevel likes Vario Clean as well.
But if you want to take the old glue off and put fresh glue on every time you reglue, by all means. To each his own.
Sent from the Oracle of Delphi by the Pythia