Going to try an AC recharge kit, should I add oil or UV dye?

Thanks all, really helpful advice. No stop leak additive it is and I think I'll order an amazon refill hose with gauge for $13 and a $10 can of R123a from walmart. I do have actual gauges somewhere but they are very old.
This is the $13 gauge on Amazon that I recommend. The knurled textured QD coupler is sturdier than the other charging hoses with the smooth rimmed coupler.
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As mentioned above, if the system has stop leak in it, repair shop evacuation/recharge equipment will detect the foreign material (stop leak) and shut down.

If the car in question is on the path towards the scrapyard in a couple of years, I'd day go ahead with the stop leak and dumping in a can of refrigerant. If the car has a longer glide path, you may be shooting yourself in the foot using it.
It doesn't sound like he's going to take it to a shop for a quick fix. And I doubt he's looking to keep his 20 year old car until the cows come home. But if he can get thru the rest of summer with a cheap fix, I'm willing to bet he'll take the easy cheap route. And as a side effect, have cold air blowing on him for less than what a world class air conditioning repair would cost.,,
 
AC stopped working for the first time in the life of the vehicle (2005 Odyssey). I verified the relay is okay. I assume the refrigerant just finally got low enough to trip the low pressure switch. I scheduled a visit with my local guy but won't be until next Thursday so I figured I could try a $30 kit with some stopleak in it just to see if it's simply too low to kick on. I don't know if it would be worth adding a drop or two of UV die or PAG oil (I think they make this a combo nowadays). Any advice would be appreciated, especially if I missed a basic troubleshooting step.
Most of the recharge kits have a leak detector in them.
 
It doesn't sound like he's going to take it to a shop for a quick fix. And I doubt he's looking to keep his 20 year old car until the cows come home. But if he can get thru the rest of summer with a cheap fix, I'm willing to bet he'll take the easy cheap route. And as a side effect, have cold air blowing on him for less than what a world class air conditioning repair would cost.,,
Still runs and shifts great with no rust in the northeast. Trying to keep her going as long as possible.
 
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