So, i recently switched over to Randolph thinner and Dope. Prior to that i used sig dope and a fast drying hardware store Lacquer thinner. I've had some problems in the switch over i want to share. After doing a small repair on the elevator, which involved sanding and filling the defect with a small amount of glazing putty, I sealed it with a coat of clear. After it dried i sprayed the white. This caused the repair to look worse. My guess is the Randolph which is a hotter, slow drying thinner penetrated Through, around and underneath the repair and ruined all the previous steps in getting it flat and smooth. It seems to me there is a reason for 'Spot Repair thinner', which is a fast drying thinner. I also wonder if this is the reason Windy did not use Sig or Randolph thinner, but a cooler fast dry spot repair thinner called dupont 3608s. Any thoughts on this?