I used the SJ tool T000T0681F for inserting the driveshaft seals. I came with the handle. See the picture on their website. There is also a small fitting guide.
The only problem I had with the SJ tool was that it didn't want to slide nicely over one of the splined driveshafts. But some "elbow grease" in combination with some sandpaper (or similiar) to smooth out the bore in the tool fixed the problem.
Any sealant which sticks on metal, forms an elastic seal and is resistant to oil will work.
I would not use the loctite 5331, the Hylomar you mentioned looks like to do the job properly.
Use some gearbox oil on the inside diameter of the seal when using the tool. (not on the outside of the seal).
Have Fun ,
Freek