Originally Posted by sr1355
And to clarify it 4 parts to 1 part by weight not volumne...IIRC...
Actually, in this case, they are the same thing, given the specific gravity (is that the right term?) of each. Anyway, it's close enough, as you can mix anywhere from about 10-to-1 to 3-to-1 anyway, so no big deal being exact.
And I'll add my vote to DIY mixture... much cheaper, you can make it thick or thin as you desire, it'll save for a while (though not more than a few days or weeks before mine gels), and you can make the volume you need.
I buy the cheapest silicone in a caulking tube at Walmart. Same for mineral spirits. And mix as someone else said, in a jar or bottle with a few loose nuts. Put on some disposable gloves and paint or wipe on and wipe excess off. Hang to dry, which is pretty darn quick. Repeat a time or two. Test. Works great.