I'm trying to spray some B8 Tec base mixed with TRS 4 base coat reducer. When sprayed out, it looks like it has sand in it, like it's rough. I have sprayed this in the past and never seen this happen. The reducer is about 8 months old since it was opened, could this be my problem?. I would just call the Martin senour tech line but I'm trying to get this done over the weekend. Thanks.