I base coated with Tamiya acylics, waited about 2 days, put Winsor Newton artist oils on top and when I started to manipulate and blend, the base coated started to lift,not immediatley, but the areas most hit, i did have some wn turpentine on the brush, not alot , just lightly damp.

Any suggestions?

turpentine will lift the paint. WN is made for cleaning the brushes out and is too strong for most any paint. I use Mona Lisa thinner for oils as it is mild enough to not cause any problems with acrylics or even rattle can paints.

what about Turpenoid?

or hitting it with a flat varnish prior to using oils?

Testors Dullcote or Glosscote are lacquer based and are pretty tough. I've used them for years to seal the base color to keep it from being destroyed by the various thinners I had. Different countries I've been in had different thinners some hot, some not. Learned the hard way give it a coat of glosscote or dullcote to protect your cammo job and before weathering.

Testors Dullcote on a figure?, you said weathering, just to be clear this is a figure, not a tank

oh yeah your right. I rarely do figures anymore but I don't see why you couldn't put a light coat of some type to protect the base colors of the figure. I'll have to look at my book collection to see if that's feasible.

thinners are a strange beast...test..test...test...different brands and different country and everything can change,even the name,here i use white spirit,low odor turps and Pure Gum Turps from a brand call "Diggers" from hardware store and i never have any problem,even on Enamel,but here on the forum you read many from the US complaining about the "same" Thinners but different brands and country...i use Hardware store stuff only because were i live and have no choice,but if you can buy quality stuff in some Artist store,they are more refined and less hot,the price is higher but you dont use much,keep the turpentine to clean the brushes

I'm awful at painting figures, so when I manage to get an acceptable result with painting, prior to washing and filtering, I hit my figs with a spray of Testors Dullcote. I'm not a big fan of it but I need the something to protect it from finger prints, particle dust and other things. With that coating on, I can go to town with oils for shadows, pin washes and oil blends with thinner for highlights and filtering. I know what I need to do, but my results never seem to be what I'm shooting for.

I use odorless thinner from AK or MIG and works fine... After some bad experiences with white spirit or turpentine, I prefer to be safe.

After all, a bottle lasts for 10 models or more, the cost per model is not that much.