has anyone ever used Forever Black? It's not a clear gel protectant, it's more of a dye. They have it for black trim but I wish they had it for grey also. check out the website foreveverblack.com. let me know what you think.
I have the black and it works great, you have to re-apply every so often as it washes off over time. However the plus is that it brings back some older fadded trim real well.
