I think there is; it feels like kind of like a slightly waxy product buildup. I've experienced it twice. Once, when I saturated my hair with rice bran oil for an o/n pre poo, then DC'ed with rb oil mixed in for like 4hrs; then used a leave-in that had in wheatgerm oil and hemp as the first few ingredients, then sealed with more rb oil. The second time was when I did two overnight (<9hrs) pre-poos with alot of rb oil in the same week, and was heavy handed when sealing. It was basically O/D So you can see why. Like everything else, moderation. I always recommend pre-poos first and then see how your hair responds
Depending on my hair's needs I will vary the oil I use; I may use the ceramide oil straight or mixed with another oil like EVOO; I may vary the length of time of the pre-poos, and on some occasions DC with them.