I have a few decals on the windows of my car; do you think it's safe to Klasse right over it? I was thinking that KSG might be a good protectant for the stickers, but will the AIO's cleaning properties harm them?
I would not AIO on stickers (but you can decals, which are vinyl?) either ways the chemical cleaner in the AIO might do some damage.
As for the SG, I would go over the sticker if you are doing the parts around the sticker anyways. I wouldn't expect much protection from the SG though - just my thoughts - Steve