Building wheels with XM819 UST. Spoke length, loctite, tightening?

[Wolfgang Weiss]

I'll be building a wheelset for the very first time with XM819 non-disc rims, Novatec A141SB\F162SB hubs with DT Swiss Competitions spokes but I'm not very sure about spoke length. I used Mavic spoke calculator and according to it I have to use 258mm for the rear wheel and 254mm for the front but how correct are those numbers? I know that UST rims are pretty tricky when it comes to building wheels so I'm pretty suspicious about those calculations.
Also which loctite should I use for the eyelets and how much should I tighten them? And are there any other things that I should know before building those wheels?

 

[klunkrider]

If your suspicious about the lengths, I'd measure the erd and hubs yourself (no, I don't even trust manufacturers to measure properly) and redo your calculations with a few different calculators and see what you get.

I had an XM819 that I stripped off a hub and rebuilt and I greased the nipple cups because stripping it had been a real pain with a lot of the cups quite seized and needing to be replaced.

 

[klunkrider]

To be clear, I'd always recommend measuring parts yourself. I've found dimensions in the wrong places (centre to flange distance listed as flange to locknut, left and right measurements for hubs mixed up or listed as being the same when they are very different etc) or just plain incorrect measurements from manufacturers, retailers and in spoke calc databases.