Glaze for old single stage paint

[taznuv]

Hi, I'm looking for some advise on what best to use on metallic single stage paint. It's on an old American car, although it has been resprayed once as far as I can tell, and it's a fairly dark metallic orange.

When I got it the paint on the horizontal surfaces was quite faded, on the sides reasonably good. I clayed the car, polished the faded surfaces carefully with t-cut, and then Autoglym SRP on the whole car. This made a pretty big improvement which I was pretty pleased with.

What I notice now is whilst the surface is still very smooth the gloss and colour fades, if I re polish with SRP it darkens the colour and brings back the gloss. It seems to have a wetting effect on the old paint.

Would I be better using something like Meguiars #7 Show Car Glaze, would this better enhance the shine and colour of old single stage paint? And what if anything would I put on top of it?

thank you