Getting ready to fit new heads outlet in DZR. (2016 Cruiser 37) and will have to trim the skin fitting for a better access for joining all the bits together. So, what is the best recommended thread sealant for the assembly? I am more interested in safety and longevity.
On my Tru-Design seacocks I used sika 291- that was 10 years ago & no problems.
Same, PU sealants are good out of the sun and do not make trouble below the waterline.
The one I am fitting is all DZR.
The threads really don't need sealant, although I usually use PTFE take. Through hulls to hull I prefer a non setting sealant like Polysulphide, but no reason not to use a PU.