So you want to get these valves etc to make your engines look m0re professional
That is great but then want to lock tite the joins !!! Instead of threading or soldering
lock tite is a glue and has no place in engineering in my opinion .
There is none in my workshop even for temporary work holding .
Do the job properly and thread them and if that is to difficult then maybe solder but bear in mind threaded are easier to re do .
Cheers
Dennis