I work for a flooring company, and we do plenty of sanding and refinishing. We reseal the floors with either an oil or water-based sealant. I would think that as long as you allow the sealant to fully cure, there shouldn't be any issues.
Much the same way that I make sure the silicone I use has fully cured before placing MY home made ornaments in my aquariums.
I believe as long as you allow the product to off-gas completely, you should be fine.
What kind of decorations are you planning?