New Moto Guzzi Door Mats Available Now
My brother used to used a product that contained diamond dust but it wasn't a gel, it was a dust. You dipped the screw driver in it a sort of dusty film was on the bit. When applied to the screw, it sort of imbedded in both the screw and the bit making it much less likely to slip. Because of it's awesome abrasive quality you had to be very careful to not use it where it could contaminate moving parts like valve stems or cylinders, or bearings. It is probably not a snake oil product but be careful with it.
I bought a bottle a couple months ago, only used it once but it worked great that time.
If you are working with Japanese "Philips Head", be aware the shape is different. It is actually a JWIS profile and a SAE Philips will cam out and destroy the head. Just like Reed and Prince vs Philips.