Thinners for Tamiya primer...?

Hi all,

Normally I decant Tamiya grey primer for airbrushing, although sometimes I find it goes on very course with a spider-web appearance - very similar to Tamiya lacquers when they're not thinned.

I'm happy to thin the primer a little, but what do I use? Is good quality automotive thinners the correct thing? I've really got no idea... and don't want to purchase the incorrect item.

Any advice appreciated.
Cheers,

Mark

Tamiya laquer thinner is just the stuff.

As is Mr Color's Leveling Thinner...

hth,
Bill