What you refer to as ultra grey; Yamaha calls Yamabond, Honda calls Honda Bond, Kawasaki calls Kawasaki Bond - I use Three Bond 1184 - different names, but pretty much the same stuff - Kawasaki bond is a little thinner and more silver than grey, Yamabond is a little thinner than Honda Bond and Honda Bond could be Three Bond with a different label. I'm not sure what KTM or Suzuki uses - I just use Three Bond 1184 universally - I can get it faster and cheaper than the others.
One thing you will not find in my shop is RTV or silicone seal - I do have a few tubes of FIX ALL - it's a product from Multi Mist which was sold by Certified Labs - unlike silicone seal, it is a self leveling cohesive resin that is gas and oil resistant - when cured, it will stretch to over 3 times it's length and is an actual adhesive - I discovered it when patching tarps used to cover loads of roll-formed steel on semi trailers - cut a piece of material from an old tarp large enough to cover a tear in a good tarp - clean the patch and the good tarp with MEK or Acetone, coat the patch with Fix All on one side, place the patch over the defect (tear or hole) of the good tarp, roll the patch with a piece of pipe to remove air bubbles, place a weight on the patch and allow to cure - the patch is waterproof, solvent resistant, flexible at sub-zero temperatures and permanent - prevents the defect in the good tarp from expanding which ultimately makes the good tarp a junk tarp - occasionally I will find a use when working on motorcycles and ATV's - one time I wanted to stop an oil leak without taking the engine apart because the engine was on it's last leg anyway (it really was not worth fixing) - I cleaned the seam on the engine with Acetone in a pressurized spray can and applied the Fix All externally to the area of the leak - 5 years later, the engine was junked - the Fix All was discolored (changed from crystal clear to yellow and cloudy), was still adhered (could not pull it off and resisted being cut) and the leak was still sealed. It was expensive ($35 for a 10 oz tube), but was a product of the space program - unfortunately it has been discontinued and I can not find an equivalent product.
Shop Owner and Mechanic with over 50 years experience