Possibly. Possibly. Yes.
Re-application can cause an OD. Build up is technically from using -mones every day for a while (whether you wash
or not). People think that the skin absorbs the -mones, so they don't wash off completely at first. Over time,
that's build up. Build up usually becomes an OD because you end up having too much product on you. Therefore,
re-application leads to both ODs and build up, and so does not showering before your next application.