How do you seal decoupage?
To preserve the job, particularly if you expect the object to get wet, it’s wise to seal it using either varnish or polyurethane. Before you do so, gently buff the decoupaged surface with steel wool, then clean it with a damp cloth. Once it has dried, proceed to apply the sealer.
How do you seal fabric to wood?
The most popular glue is mod podge. It’s a multi-surface adhesive that works well with both fabric and wood. You can also use it over the fabric to seal it. Another popular choice is a spray adhesive designed for fabric.