If you are looking for a liquid you could use a product like this, but its not going to make it look any better... but it may help prevent it from catching dust and debris or from catching on something and getting worse.
The product above is not quick drying, it will take about 7 days to cure. So if you decide to use it you nay want to protect the area by covering it with a bucket or something so that no one steps in it or to prevent it from collecting lint, dust, pet hair, etc.
Go to a flooring store. Buy a very small container of flooring multi-purpose adhesive. Use a paint stir stick or anything thin and put some adhesive under where it is lifting and then put some weight on it for 24 hours. Wipe off any excess with a damp rag before you weight it down. Also buy some vinyl seam sealer to fill the gap while you are at the flooring store. Put it in the crack after the adhesive dries. Don't worry about getting too much on, the extra will wear off with foot traffic. This is for regular vinyl.
If you have one of the vinyl-backed vinyls (the backing will be really shiny) you need a different adhesive made for it. But the repair process is the same.
We have a 5th wheel RV that has sheet vinyl on the floor. There are a couple places where I believe there is some lifting of the sheet vinyl because when you step in those areas or press on the floor, you can feel the floor "give".
We took one of the floor register covers off and the sheet vinyl doesn't appear to be adhered to the floor that's under it.
I've seen videos on fixing engineered wood flooring, but so far I haven't found anything for sheet vinyl except one for Mohawk flooring where they used a syringe to shoot some kind of adhesive under the vinyl then rolled it out.
Can someone tell me the best, or at least a good way to glue down the bubble areas? Preferably something SIMPLE and idiot-proof.Read More