Paul,
When I removed all my stickers and replaced them, I purposely abused the areas that the decals were going to be reapplied by using alcohol on them. I tried to oxidize those to be sure they were very dirt and oil/grease free. I put the decals on, let them sit for several days, some in the sun, then reconditioned those areas with the decals in place. So far, so good and they are sticking well, and the paint under them looks as fresh as the rest of it, considering it's all 21 years old. Photo link attached.
 
Bob Stevens
'87 Syncro Westy
http://tinyurl.com/6rfc4o
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