I got this bike used (supposedly 1400 miles) and being my first carbon frame (it's a Cannondale Supersix) I was not capable of reasoning these two matters;
1st- I recently removed the seat post and was checking inside of the frame out of curiosity and this yellow material on the top tube and seat tube caught my attention. Is it a common material applied on connections?
2nd - Bike has the original yellow and jet black colors. When you observe the black areas under direct light, you can see this hazy tone differences under the coating (?)
Is this normal in carbon frames since it can be seen throughout the frame but not in a typical pattern? And what is it supposed to be? Resin?