I am using and Interior oil based primer and paint, and need to what is the best thinner and thinner ratio for preparing the paint to spray with a Wagner power sprayer. Any tips on this anyone?

The thinner normally used for alkyd paint is mineral spirits. However, I expect that you're going to want the paint to dry rapidly once sprayed, so I'd run the idea of using acetone as your thinner by any places that refinish furniture in your area.

The polyurethane resins used in furniture "varnish" are really just modified alkyd resins. So, whatever works for alkyd based polyurethane "varnish" should work equally well for alkyd paint.

Ditto for an alkyd primer.

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Thanks. Any recommendation on ratio of thinner to paint?

No, I don't do that kind of work.

However, any furniture repair or restoration company that sprays polyurethane should be able to tell you what thinner and mixing ratio they use, and I'd go with that.

NO, do not use acetone for a thinner. Mineral spirits is used for thinning oil base or polyurathane paints. Thin the paint till it is of a consistancy of fat free milk. then filter it through a paint filter. use normal paint spray proceedures, move quickly and dont spray in one spot or you will get runs. move the gun parallel with the surface and not spray in an arc. begin spraying before the paint reaches the beginning of the surface an release the trigger after the paint leaves the end of the surface. With a little practice you will develope the correct rythyme ( how ever its spelled )
I cannot tell you the ratio of thinner to paint, but you wll be able to tell if its too thick or thin

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