SAG has a rule called Global Rule 1. It essentially says that SAG actors cannot work on non-SAG films. If they do, they can get fined , suspended or even expelled from SAG. (the exception to all to all of this is if the actor has elected to go CORE, in which case they can work for any film, union or not. SAG , in my view, put up a lot of roadblocks and false information about CORE, which is a right given all union members by the Supreme Court). So as a member, you should insist that the film go SAG. If the film is owned and financed by a company not based in the US, and shot entirely outside of the US, then a special application, called a GR1, is used. This means that only SAG actors are covered under the contract and the locals are not. By being SAG, that means the actors have to be paid SAG minimum (low budget rates do not apply), and all other SAG requited benefits, including air, hotel ,residuals ,etc. The actor cannot waive the minimum benefits and salary.