Interesting... I just talked to a Unilock authorized dealer in my area. I told him the situation. He suggested I rip up what I have down because Unilock will not guarantee pavers adhered to any surface. They must be layed according to their specs to be covered under the guarantee. Their specs are to have a compacted surface, then the pavers, then sand in between. Now I'm more confused!
I look forward to other opinions! Thanks again. -Steve