GF Swimsuit Wam - Best way to mix gunge???

As per my previous post my GF is going to get mesy in her speedo swimsuit and knee high boots this weekend.
I have ordered gunge mix off ebay but what is the best way to mix it to get a good thick slime???
Any other mesy ideas alongside the gunge are welcome
I have ordered gunge mix off ebay but what is the best way to mix it to get a good thick slime???
Any other mesy ideas alongside the gunge are welcome
