Hello! I've heard there has been a lot of debate about ALEX being safe or not for either skin or the environment - so I've started to conduct scale swatch test for different types of readily-available pure silicone caulk. It is a little more expensive than the ALEX plus (which is labeled as a "siliconized" latex), and its not always available in the 12-pack box the ALEX comes in.
So far, these are the brands I've applied to neoprene - scraps from my ALEX tail.
Test 1:
http://www.caulkyourhome.com/ge-sili...kb-supreme.php
http://www.caulkyourhome.com/ge-sili...or-supreme.php

Test 2:
http://www.caulkyourhome.com/groov-k...h-plumbing.php
http://www.caulkyourhome.com/groov-e...r-interior.php

Test 3:
http://www.dap.com/product_details.a...89&SubcatID=25
http://www.dap.com/product_details.a...25&SubcatID=26

I'm not just waiting for the 24 hour cure time, but soon I will post with my photos and results from each swatch =D