West does make a great penetrating epoxy.

It may save you a little money if you can find it locally. It will be a little more expensive to buy it locally as far as up front cost, but you will get slammed with shipping costs as it is a hazardous material. Price both out and find the best value, cheaper with high shipping, or just higher cost up front and no shipping, do some research and find the best route.

I found it at a bigger marine dealer.