Devcon Plastic Welder
Devcon produces adhesives mostly for industrial use. While this particular product is packaged as a twin tube syringe for ease of use, the same adhesive comes in 400 ml cartridges, 2 liter kits, and commercial kits that are 10 and 100 gallon; if you need a lot of epoxy, this is the pick for you. As an industrial adhesive, this epoxy has excellent chemical resistance, probably the best I've seen. The adhesive gives you a 4 minute work time and cured parts can be handled in as little as 15 minutes. with the full cure providing 3500 PSI tensile strength. This particular product is clear when set but the company offers similar products that are tinted black and white. The black epoxy is also UV stabilized, so it won't fade on you.