If KRI Golok have great stealth capability like advertised, I am not against getting more of it, preferably the newer design like in this picture and it should be faster and have longer endurance (than KRI Golok).
First thing first, even though many media (both ours and abroad) reported it as "stealth", I will be the one to claim that KRI Golok, as well as its predecessor, does not possess such capability in its current iterations - at least not as advanced as, say, Visby class corvettes. It is, however, a low-observable ship due to its construction and materials used since I believe its head-on RCS will be considerably smaller than conventional ships like our KCR-60 / Sampari-class ships. Mind you, KRI Klewang was supposed to be the first prototype that if it hadn't been destroyed in a fire, its testing data would be used to make important changes in KRI Golok.
Regarding its speed, something must have happened back then that made them changed its listed specification from 40-50 knots to 28 knots maximum speed. It could be either due to the changes in its engines, or that they think that its real capability should not be advertised publicly, or some other reasons that probably will never be made public.
Whatever the reason, it is still the first prototype in which the final form of the production version may differ in some aspects. Unfortunately, most of us are still not used to this process of product development since we kind of expecting 'instant result' or that anything that should be taken one step at a time is considered as a waste of both time and money.
Case in point: Remember SpaceX many failures which were always shown publicly when they were testing their Falcon 9 rocket? They weren't wasting money and time by celebrating their failures. Instead, they made clear signs of progress from one failed prototype to the next, and now the landing of their Falcon-9 rockets is something that has become a usual sight.
As a comparison, think of why the Soviet Union failed spectacularly to make their N-1 moon rockets. They tried four times, all failed, due to the lack of static testings of their rocket engine as well as various other shortcuts that were politically motivated.
I don't know what paint they used, but I still remember that KRI Klewang had a rough surface. It could be either because it was a rushed product, or it was actually deliberate since the rough finish was meant to scatter radar signal or for some other reason. We may never know, though.What paint is used for the ship and where did they bought it from, Sweden?