Varistor any experiance in correcting process contamination of.

At present the band-aid fix is using epoxy 'dam' under the part and masking over the part to pervent excessive current leakage conmonent failure. These parts are first going through the reflow oven, where the epoxy dam is used to over come the leakage; than, after TH parts the varistors are going through the wave,being on the bottom. Here the latx is used to protect them. Is the any feed back regarding experances in handeling varistors in the process?

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