I don't know if I'm being a bit slow and you have all worked this out already but I've just discovered that watercolour paper is absolutely fantastic to use with your Promarkers!!!
I've been preparing some more video tutorials and have been playing around with my using my Promarkers on different papers and I can't believe how amazingly well they work when you use them on proper cold pressed watercolour paper.
I've avoided it in the past because for some reason I thought the promarkers just wouldn't get on with it - I assumed it would be too thick and too absorbent and that the pens would blend well - How wrong can someone be!!!
Sorry for the terrible photo I don't know if it makes it clear - but I wanted to show you how great the promarkers blend together on the paper. All the colouring and blending just seems to look so much more professional.
But the best thing for me has to be that the pens hardly bleed over the lines at all. No matter how much you blend the colours and put down more and more ink it seems to stay where you want it. This has always been a problem for me in the past as I'm a bit generous with the amound of ink I put down on the paper - but with this paper it's not an issue any more.
I'm filming the tutorial for this image today - showing how I coloured in the Deckchair Dreaming bear. It should hopefully be up here tonight and you'll be able to see far better what I'm raving about. For me it's like working with new pens - they just blend so much more easily and the colours seem to work together better - amazing!