I've covered my resistors and solder joints with GE Silicone II sealant and have never had a problem. The curing does not impact solder joints and I've used this product for some 20+ years.
I can't measure any resistance using it. It cures in several hours similar to a rubbery type substance. And, it is easily peeled back when needed. Around here in CT, it is available in 2.8 oz. tubes in most hardware stores. Jim, K1PX K1PX at msn.com _________________ Topband Reflector