Finishing sealant to reduce tackiness

[DemostiX]

I'm quitting after the first two pages of few searches of the web on this, and turning to folks who may have solved this.

I'd like to finish ridge-line silicone seam sealer after complete curing, one day, a completely tack-free surface before it coheres to itself and before dirt adheres to it. If this were a tire tube, I'd dust it with talc.

Has someone come across a product or method to do this? Maybe some kind of non-toxic but transparent dust? If this were a tire tube, I'd dust it with talc.

The sealant I've used is the much-liked Permatex silicone windshield sealant, which has excellent wetting and adhesion properties.