best substitute for butyl rubber caulk?

Hi,
I've got a replacement closet ring for a toilet that says to apply a bead of butyl rubber caulk to the underside. I could not find any butyl rubber caulk at Home Depot or Lowes. Is there something I can use instead? Like roof sealant (also good for gutter repair) or regular bathorom silicon? There's also some silicon Ultra product that has rubber in it.
Or is there a place where I can get butyl rubber caulk?
Also does anybody know if I can just use plain zinc plated screws to attach the ring (it's a Superior Tool Super Ring) or do I need something special like stainless steel?
Thanks
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Tell you what. Go to Google (Google is your friend) and search for Superior Tool Super Ring. It will get you to Superior's web pages and then search for butyl. Part way down the butyl search page you will find what you are looking for. $2.99 + shipping etc.
Charlie
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actually I did google ... for butyl rubber caulk ... I got the impression it was a obsolete product, but I went directly to the superior web site first, looked at the product list and was tempted to send mail to engineer but figured I get a faster answer here. (? when I search for butyl on the superior site, I don't get squat)
anyway, I checked out the dap website and the roof caulk that i've used before is butyl rubber, although I got it at HD and the one I picked up recently at Lowes isn't the same, although they're both DAP. I've notice this with the bathroom stuff, too. Different packaging and item numbers. What's up with that? anybody know if one is better (maybe one company has higher safety standards or something) or is it just a business thing (no we won't price match that or something)
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I don't know why they changed the tubes and the names of the caulk. For many years Macklanburg Duncan marketed an excellent butyl rubber caulk. They were bought out by GE. They still make the same caulk, but the tube says gutter and lap sealant. Butyl rubber gets mentioned in real fine print on the back of the tube. I am a believer in polyurethanes, a hater of silicone, and I do not see either of them as equal to butyl rubber for certain applications.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Keep the whole world singing . . . . DanG (remove the sevens) snipped-for-privacy@7cox.net

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thanks for the advice. I agree. esp. with something like a toilet, you don't want to use an unsuitable product.
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scribbled this interesting note:

We use NP1 for lots of applications. I've even used it for exactly what you describe. Here's some sources of information... http://www.chemrex.com/productcatalog/detailPage.asp?prodID10
There are others.
We buy ours locally at the roofing supply house where we buy other roofing materials. Call around and you too could probably find a local outlet for similar products. At Home Depot they usually have some urethane products in the concrete section as well, although they usually want more than what you would pay for a similar product from a real supply house.
-- John Willis (Remove the Primes before e-mailing me)
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