Strong can be too hard!
I used what I’d learnt from my recent strength test experiments to make sure my latest polymer clay jewellery was cured to make it good and strong. The pieces were cured at 160ºC for 30 mins. I was pleased when I handled them, they seemed good and strong. Then I tried to sand them. Yup they are strong, and hard and that makes them really hard to polish! I spent about 4 times longer than I normally would polishing this flower pendant and I am still not at all happy with the finish.
So my advice is, think about what you are making and what it’s purpose is before you decide how to cure it! Make it strong enough, but not too strong!