I thought I would give a summary for others
I eventually found a company called Transpacific Bituminous products, they make a product called Bitucolour. It is a product, that after a Lot of stirring you can roll on to the asphalt surface and it basically looks like paint.
My asphalt is about 7 years old and I think it would be best doing it every few years. My asphalt had a lot of cracks in the surface, when I tried to resurface it I was using 5 times as much as suggested.
I eventually worked out that if I add 25% thinners, stir very well and pour it on to the surface with an old saucepan then spread with a roller I got a reasonable job.
By doing it like this, the sealant ran down into the cracks and I have coloured all the previous black cracks the same colour as the surface. It does look much better although it still looks like a textured, painted surface, not great but better.
Asphalt thoughts :
Would not have it again, pay extra and get concrete.
Needs sealing at least every few years.
Thin Bitucolour so that it gets into surface cracks.
Stir regularly to keep colour even
Do in spring when not so flaming hot