Sealant/top coat for painted PVC

I'm making a rusty iron pipe, my character's weapon of choice. So far, I've got a piece of PVC pipe painted with textured and non-textured spray paints and lots of acrylic paint for rust details. I'm really pleased with the results so far.

Should I apply some kind of top coat to protect the paint job, and what type should I get? This is my first time making a cosplay prop. I worry a little that the bits of grit from the texture paint will make it more likely to chip off. Any advice, please!

Edit: I did make sure to properly clean and prime the PVC before painting.

Matte clear varnish or acrylic should suffice. A smooth paint job may not need it, but with texture in the paint it's a good idea.

I agree with what another person has said, use a clear varnish to seal it all in.
I like to use a spray varnish, I find it at my local craft store where the model cars are.