Anyone remember back in primary school, in art class. When you'd smear PVA glue over your hand just so you could then peel it off.
You can do the same on your fingernails.
Step 1. Waiting for the glue to dry.
Step 2. Apply polish and wait for it to dry. Try not to go over the edge of the glue onto the nail.
Step 3. Peel off glue. And polish
Step 4. Clean nail and a pile of polish
I haven't yet done a full mani with this, or found out how long it will last but I'll let you know.