I like tru oil a lot, and was very pleased with the result on my ESB-4 (sig), but I reckon at least three coats of their sealer filler sanded back before actually using tru oil. I think the ESB had a coat of sealer filler, then tru oil, then realisation that it wasn't going to work and about 3 more coats of sealer filler! I could then sand that back quite aggessively and go for the tru oil. I doubt I have more than about 10coats of tru oil on the sealer filler...