Mixing paint for markers

Im sure Im being an idiot, but I couldnt see this covered in any of the paint/ink mixing threads above

Fairly new to customizing my kit, although ive been writing for about 6 years now. I tried mixing a drippy pink paint for my edding 750s. Herez the dillion:

1 part white house paint

2 parts thinner (white spirit)

Squeeze car wax (give a cool glossy finish)

Red acrylic paint to tint the mixture

Now the problem here is that white spirit seperates the acrylic paint into constitute parts of dye and oil. So my question: Should I invest in another pot of house paint (This will mean I have to use more thinner, cuz its pretty thick) or should I change my thinner? if so what to? Or have I got the whole process arse over tit? any comments/suggestions welcome

try INK RECIPE SUPERTHREAD>

thanks