Hi waltini,
I have been exploring this issue recently (I am also a beginner at watermarking). I have a recent thread covering fluids here:
https://goscf.com/t/29155 which I will be adding to over the Christmas holidays.
I tried the signoscope and a rollatector before I ever tried watermark fluid. I like the watermark fluid the best but I am trying to perfect/learn to use lighter fluid as it is by far the cheapest.