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So while I'm not happy with this primer, mainly because the paint and primer gets removed with little to no force by my fingernails.
While this should not be a problem, I find it irritating when the GW primer is so strong, and yes I do clean my models before painting them.

I based my models in Vallejo Brown Earth and I am afraid any fluid will ruin the result.

My question is, how can I strip this without ruining the bases?

If water resistant, I belive that It might be possible to use hot water and a stiff toothbrush to remove the primer, but I don't want to ruin my bases so I haven't tried it yet.

I have bad experiance with breakfluid and I'm afraid the other products will ruin the base.

Warm water and a toothbrush should do it. Or simple green (simplegreen.co.uk).

But you really should mount your models when painting and not touch them till they're sealed. Short answer; be a bit more careful. :-p

The Vallejo Surface primer takes time to cure properly - give it at least 24 hours. Applied by airbrush, it should go on glossy - if it's matt all you're doing is dusting the model, and you need to reduce your pressure and spray distance a bit. It'll still get worn off edges - it's not a solvent-based primer that 'bites' into the surface; it's more like a gesso. Rough handling will not do it any good.

Yeah, I don't really touch them, but its the knowing that it comes off so easly that annoys me...

Anyway, thank you for your reply.
If I would throw on a farnish on the model, would that stick or would that also rub of easly?

I find it sticks pretty well, I airbrush on W&N Galleria Satin (thin with water and a drop of flow improver) and I don't find models to be particularly fragile.

You also need to wash your models before putting the PU on; unlike a solvent based primer (which 'cuts' through grease) the PU really comes off easily from a slick surface. Quite often I'll give things a quick rub with a 600 grit sanding stick (one of the flexible ones) just to key the surface and take off any 'too sharp' edges.

I find that the Vallejo primers do better if you let them cure for a while before doing anything more to the model. I tend to give mine a good 24 hours and I've not had the problems you mention.

On the stripping side of things, I've used simple green and a toothbrush with no problems.

Honestly, I use the surface primer too, and ive noted the same behavior, but it actually is the best primer ive ever used and none of the minis ive painted have issues with paint rubbing off (and I havent even sealed them yet). Just suck it up and trust the product.