Loctite 242 as a sealant between plates

[BARSPRECISIONMACHINE]

Anyone out there ever use Loctite 242 or 243 as a sealant between two (very flat) aluminum plates?
Will it keep compressed air (80psi) from crossing small adjacent pockets?
BTW the plates the aluminum jig plates are 18” square by 3/4” thick and have many M6 socket screws holding them together.

 

[John Garner]

Haven't done it myself, but I'm familiar with anaerobic compound being used in exactly that way in both steel-on-iron and steel-on-steel applications. Can't say more -- beyond it worked well -- due to non- disclosure limitation.

 

[Scottl]

Haven't done it myself, but I'm familiar with anaerobic compound being used in exactly that way in both steel-on-iron and steel-on-steel applications. Can't say more -- beyond it worked well -- due to non- disclosure limitation.

Many years ago I bought one of those early Taiwan made Delta benchtop drill presses and I applied 242 at assembly such as where the column flange bolts to the base. Someone I knew and respected said it prevented movement from vibration on such a light machine and slightly increased stability by filling tiny gaps. Given his background I listened to what he said.

 

[jwhartley]

If you look at the Loctite website for 243: https://www.henkel-adhesives.com/us/en/product/threadlockers/loctite_243.html

There is the implication that it has some sealing abilities.
But I would chose something from their sealant line like 518: https://www.henkel-adhesives.com/us/en/product/gasketing-sealants/loctite_518.html

The thread lockers are kind of thin without much gap-sealing ability. The sealants like 518 are thicker and have some gap filling.

 

[BARSPRECISIONMACHINE]

Thanks guys for the reply(s)
I think I’m gonna chicken out from the Loctite and use a low viscosity epoxy.
I know THAT will hold pressure.
It will also be quite permanent but in my case that’s okay too.