Here we go again on the risks associated with CA. As yet we do not know the long term effects of using this substance. Years ago asbestos was a revelutionary product and the answer to many problems. Well we all know where that led us. I personally don't use CA for finishing I do use it for small glueing projects but not for finishing pens. I am not saying that you should not use it that is entirely your choice. The only point that I would raise is that if you want to use it as a finish for your pens you should ensure that you take adequate measures to reduce the amount of fumes that you inhale. Suitable ventilation to remove fumes and respiratory protection with a suitable mask is a must for prolonged use.
There are numerous Health and Safety data sheets available for these products here is an example of just one of them
https://www.mkmbs.co.uk/Root/Documents/B000790.COSHHData.pdf
I will end by saying that you only get one set of lungs so look after them.
