The chemicals shouldn't raise the grain... they are solvents that evaporate quickly and not enter the wood like water does. They usually have a second substance that ''deactivates'' them so that the addition of varnish does not strip away or thin.
You will not have to ''get it all'' as the intent is to refinish with varnish. You only need remove enough to remove the embedded mold. He could do the whole piece if he chose. But even that would only require a light sanding in areas that were not stripped. Wiping down to remove residual dust. Refinishing with another layer of varnish.
We don't sell them, but either of the Big Boxes should have a Minwax products that refinish furniture.
Just using the chemicals in a closed space is not recommended without a special mask that has interchangeable filter cartridges suitable for the job.
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