I'm getting ready to order a model of the Ford J-Car. I haven't done any models at all for about 30 years now, but I remember way back when, there used to be a product that, when you'd apply it over a decal, it would cause that decal to bond better and mold itself to the shape more completely.

Does such a product still exist today, and if so, what is it and where can it be purchased?

TIA.