If have NOT tried this method, although I was planning to do it. My layout is not quite ready for water.
The instructions to which I linked specify that you should cover the lakebed or riverbed with hydrocal, let it dry overnight, then paint the hydrocal, and let the paint dry overnight. Only then should you pour the Future.
Did you do all of that and still find the floor wax soaked into the scenery? If so, I will have to reconsider my plans to try this method.
Water products will find the smallest hole and leak away into your scenery or even completely through your layout and onto the floor. You must completely seal the bed of your water feature.
If you did that and your "water" still disappeared, I can't explain it!
- Jeff