I know nothing about Defts Waterborne. Is it an acrylic lacquer?
Now I do know a lot about the possible outcome of KTM9. I have used it since it came on the market. Those that want all the nitrocellulose attributes from an waterborne Acrylic lacquer will always be disappointed. But if you need a durable clear easy to use finish without the chemical hazards of a solvent based lacquer then in my book KTM9 is a great product.
I use it on more than 50% of my guitars with no complaints.
Is it as hard as nitro?
Well my ding testing showed it to be with in 80% affective at repelling minor dings as nitro. (controlled BB drop testing)
is it as clear as nitro?
I will put one of my KTM9 guitars next to one of my nitro guitars and unless you are trained well it is very hard to tell the difference visually.
Is it as easy to repair as nitro?
I have had no problems wit repairs.
Noes it cure with the typical Blue tint that waterborne are known for?
I do not see blue at all unless it is applied way too thick.
Now all of this is subject to finish application experience with the product.
But then again there are so many that want to defame it just because it is a waterborne or does not exhibit all the nitrocellulose characteristics, It must be a worthless product and I must be out of my ever loving mind for using it.
By the way for those of you that don't know I love French polish and think it is probably my favorite finish and I highly recommend FP for a first time finish. But none the less I do recommend KTM9 as a viable finish.