If the basement's cinder walls are not sealed on the outside, not much you can do. You definitely don't want to trap the moisture in the cider walls. Mike Holmes would excavate the outside and seal it first. Then he would seal the inside. I'm thinking you don't want to go there. Paint it, use Killz and make sure the sump pump works. Just my take. Ventilate for any air moisture.
There are things you can do to take care of the problem in a permanent fashion since you have the french drain but if you are bent on having a short term solution just paint it or use Kilz. I used drylock and even with that got mold in my basement. Just be really careful with the mold and don't wait too long to fix it right.
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