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Mary, future problems with RSG have less to do with mold or varmints than what a too-thick application to raw canvas does. Too much glue is brittle, and that's not good under oil paint.
The primary purpose of the size is to isolate canvas fibers from absorbing oil, solvents, and vehicles in the paint. Ideally, a solution is about eleven tbsp. of dry glue to a quart of water. The quality and fineness of the dry glue is a factor.
First, cut that glue solution by half, to give the canvas a "drink". When that's dry, apply full-strength glue to the painting surface only. Hopefully the "drink" will keep the canvas from becoming saturated through and through with full-strength glue. When the solution starts to cool and gel on the surface, smooth it out with the palm of your hand. When dry, you may wish to lightly sand it with fine (220) sandpaper before applying the oil prime.
At this point, you'd be better off to wash the glue you've applied from the canvas (that can only improve things) and start over, so as not to have "overdone" the glue application. Hope this helps.
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