I am having porcelain tile installed on our floors. One of our rooms currently has vinly flooring installed. It appears to be firmly attached to the terrazo cement floor underneath. The vinyl still has its shiny surface.

I just finished removing vinyl flooring in the kitchen prior to laying the porcelain and it was a big pain to do. I tried using my Fein Multipurpose tool without success. Ended up using a hammer and rigid window glazer's knife, chipping two inches at a time. I don't want to go through that again if I can help it.

1. Have you ever installed tile over top of vinyl?
2. Did you use a bonding agent prior to applying the multi-purpose thinset?
3. Did you abrade the vinyl surface (by sanding or some other method) to rough it up to help insure a better bond?
4. Has the installation held up without joint failures?