Spray paint or spray gun setup

[WSSix]

I have an 01 BMW Touring that I am building now to replace my 00 sedan. I want to redo the shadow line trim on the wagon. Shadow line just means it is black. For the touring, it's gloss black.

I found gloss black and clear acrylic lacquer spray paint from Duplicolor. I used this when rebuilding the vent windows on the C10. I found it very easy to work with. I wet sanded and polished the paint easily. I'm quite happy with the results.

However, I am also questioning if I should invest in a small spray gun setup to use with my pancake compressor. Just something simple to paint small projects with.

I don't know the difference in types of paints and what's more durable. What I want is for whatever I do to come out well and to hold up to the elements including washing.

The touring will remain garaged and driven in good weather, but it will be driven and parked outside when even I want. I hope this is often, honestly. The C10 rarely gets driven at this point. While the vent windows have held up fine, I can't say it's really been exposed to the elements or even washed often.

All suggestions welcomed.

Thanks