Floetrol

I tried many products on the market is Dulux Acrylic crown and much more. I tried to concentrate to try to flow like oil base, I used air conditioner floetrol is useful, but is still not as good, I've mixed acrylic varnishes to try to get the result. I use synthetic brushes and tried tampons.

I think the acrylic seems as good as oil, but you could experiment with naphtha. You can also bitten in acrylic with 0000 steel wool and wax.

could you add a gel paste for acrylic? Usually, it gives a beautiful shine. I'm sure an art shop can advise

Research is propably cos old is old, so just put on another
layer of acrylic gloss for a facelift or call a specialist.

From my experience, you can not beat a good oil based gloss acrylics always seem to lack that little extra, if your outside, you'd be better off with oil based gloss