RE: Staybrite 8 Yes or No and why?
Used it constantly at my previous company on liquid side connections, even on R410a systems. It was great for installing TXVs because you didn’t run the risk of burning the valve up at such low temperatures. Also (and correct me if I’m wrong) it removes the need to slow flow nitrogen since the copper doesn’t get hot enough to oxidize. If the joints were well fitted and clean, using StayBrite 8 was a real time saver and made connections look very clean. The only time I had problems was on piping that had been so annealed that the solder would refuse to flow properly. Every other joint I made never leaked to my knowledge.