Hay GK, how dented, is dented?
As this primer, like all primers, is really only there to prep the surface to be painted, so when you do paint it (top coat/colour you want) it can stick better and also give better area coverage.
If you spray a light coat, let completly dry and sand back, it want really fill much of the dent.
The best stuff for dents and to fill scratches is automotive body filler, normaly just called bog. It a two part mix, really easy to use.
All car panal beaters use it (by the ton) to fill dents and imperfections. Once mixed up, fill the dents, let dry and sand back.

Have a very Marry Christmas and an excellent new year. Enjoy the long russian New Year celebrations my friend.
Be safe and throw a snow ball for me.
As Christmas day is looking like it's going to be 38 Deg c here in Perth.