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@Leaviathan 

I believe you are using the Holstein Premium rosin. I do have that rosin. I originally purchased for violin use, but have used it with my cello, but strings and circumstances determine which rosin I use.

I love the packaging. I was trying to use it with a new set of strings on my violin, but I cannot remember the brand or model of that brand. It needed to be wiped off the strings all the time. It just heavily caked on the strings. I am not really sure, but I think that meant it was too soft for those strings? Strings have different surface textures.

I have tried it on different brands of strings with success on some and quick build-up others.

I think that is typical of rosin. I think climate, strings, and your bowing would affect it.

My experience with it on a cello was that I had quick build up. That was with different strings. I am hoping that with the next strings I try that rosin will work. I really really like that packaging.

Now, it may well be that I am the issue. I tend to be a heavy bower on a cello, viola or violin, but mostly cello. I am working on that issue. I would think that if you bow heavy that more rosin will be rubbed off more quickly.

I wish it was a harder rosin. I so want to love it and be able to use it on anything. I cannot stress how nice that packaging is!

I do believe your bowing and the strings determine the best rosin. I was using a mix of different Pirastro strings on my cello. I was using the red Pirastro cello rosin and it was not working for me. If I recall, it was fine on the C and G, but caked something awful on the D and A strings, or maybe the reverse.  I was at a loss. None of my rosins worked. Mixing them on my bow did not work. Using a different bow did not help. I finally wrote to Pirastro. The strings were all Pirastro, a mixed set of Pirastro strings that was recommended to me by Pirastro. They said that their red cello rosin was too soft for that mixed string set and they sent me their Evah Pirazzi Gold rosin and that worked fine.

I don’t know what strings you have on your cello, but the Pirastro Red cello rosin is a little softer than Holstein Premium rosin, but the Holstein seems quite softer than my Jade and Evah Gold rosins. The Jade and Evah Gold are harder, Jade being the harder of the two. I also have rosin called Guillaume something or something like Guillaume  something. It is a French rosin my closest violin shop uses. That seems to be a tad different than Jade, but I can’t figure out if it is harder or softer or what.

The thing is, the strings, and how my bowing is that day seems to determine which rosin is working for me.

I have put rosin over rosin on my bow. It wears off the bow. If you are concerned, just bow until you have used up the rosin on the bow and need to re-rosin. Then put on the other rosin. I am just saying what I do and do am not telling to mix them on the bow. Many people do. I think @Fiddlerman does. I used the ”@“ so he will get a notice he was mentioned here. That way he might chime in on what I just said.

Hope this helps. I know I sounded wishy washy, but from my experience, and what I was told by Pirastro, other people and have read, there is no one rosin for all. I also read that your climate also needs consideration, especially if you do not have A/C or play outside in heat.