Gary, a review of many threads on this Forum over the last couple of years will show a hearty endorsement of Lexel. It is not silicone, but looks and behaves much like it. I've used it on our coach in several regards, but like anything else it depends as much on the expertise of the applicator as much as it does on the product used, so there was a small learning curve. Although it isn't what I deem the ultimate solution, my last and more diligent application of Lexel into the deteriorated parts of my windshield brow and seal finally stopped most of the water that was leaking into my electrical bay (forwardmost streetside hatch). If you clean the surfaces thoroughly that you expect the Lexel to stick to, and apply it properly, that stuff should do the trick. It cures as fast or faster than silicone, stays flexible, adheres better, and seals at least as good.
At first I could only find it at Ace Hardware, hanging over the caulking display. But I've since found it at Lowe's and several other chain hardware stores, although not at Home Depot
http://www.lowes.com/pd_587695-1278-LEXCD13525_0__?productId=50139922&Ntt=caulking&pl=1¤tURL=%3FNtt%3Dcaulking%26page%3D3&facetInfo=On the Oregon coast, I'd look for a Coast-to-Coast, True Value, or Hometown Hardware store, but I think there is an Ace there just down the road from you in Waldport. It is available, at least at Ace, in both a caulking gun size and the smaller squeeze tube I prefer (and no, you don't have to buy a 12-pack
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http://www.acehardware.com/product/index.jsp?productId=1419419#showReviewsI see in another thread you've already "ordered" some, Gary, but your Ace should have it in stockThe only gripe I have is that you've got to seal the tip well. Note the negative reviews on the above Ace link; they probably let the stuff set up in the tube before using it - that has nothing to do with the great results you should get from a new tube. It will semi-cure (oxidize) in the nozzle and set up just enough that you have to spend the first 10 minutes ultra-squeezing and using a wire to dig out the first inch of partially set up Lexel. That part will grudgingly move but won't flow and stick to your surface and is a pain when you just want to get a job started. I'm still experimenting with caps and techniques to use with the squeeze tube to avoid that hassle. It's not a problem if you use it every few days, but who does that? I've finally learned that if the visible product in the tube gets hazy instead of perfectly clear, it's about time to toss it and get a new tube. And cut as small a bit off the tip as possible.
When fresh and clear through a minimalist nozzle opening, Lexel applies to clean surfaces like a dream, and can be feathered with a wet finger much like caulk, as long as you don't wait long to feather it. I've taken to using it on our house too, especially whenever I drill a hole to screw something into the siding or somewhere. Lexel protects penetrations from water entry bar none. When we had the house resided this fall, and the contractor was replacing hose reels and such after the job, he was pretty impressed with Lexel when I had him use it.
Kudos again to Gerald for originally alerting us to Lexel.
By the way, Keith, there is a product out there for sealing and caulking that's called Lexan, probably for Lexan plastic products. So don't get it confused with Lexel, Gary, when you go looking for it.
Joel