Epoxy that’s safe for SMA connectors?

I'm working on something with a lot of sma connectors. The system has to withstand a lot of vibration & I dont want those connectors unscrewing themselves in the field. I remember a long time ago a tech used some kind of epoxy he used to prevent this. He'd put just a little drop at the juncture of the connectors AFTER screwing them together (not on the threads.) You could break it loose with a wrench with a little work but it didn't eat away at the connector finish. I just don't remember what it was. Any ideas what epoxy would be safe for gold or brass RF connectors?

Hi Boiir,

Have you tried neutral cure silicone rubber?

Something like this link here -> http://www.americansealantsinc.com/asi-335-neutral-cure-silicone-sealantadhesive/

It has reasonable strength but stretchy that it can resists vibration and impact forces superbly.

Hope it helps.

Best,
Neil

Could have been Glyptal paint, used for ages to keep potentiometers from changing value.

That was it! Glyptal. How did I forget a word like 'Glyptal'? Thanks. Though the neutral cure silicone rubber Neal mentioned might be easier to remove if we need to do repairs.