Technically, yes, you can increase the working time slightly, but due to factors such as the solvent used, the volume, and the working conditions, it's not possible to predict just how much more working time you'll get.

To increase the working time for TotalBoat Penetrating Epoxy, the best thing to do is to reduce either the ambient temperature or the temperature of the epoxy itself - or both - taking care to stay within the working temperature range.

Thinning TotalBoat Penetrating Epoxy by adding solvent is usually done when you need the epoxy to penetrate more deeply, not to extend working time. Common paint solvents that can be added to Penetrating Epoxy to increase penetration are acetone, denatured alcohol, or lacquer thinner.