According to Technical Support at Lulzbot, ABS is my best bet. So, I ordered the enclosure kit and am preparing to build it. I’ve been doing other projects up til now.
In response to GJG, I’ve been using XTC-3D (https://www.smooth-on.com/product-line/xtc-3d/) to seal my prints. This stuff is amazing, as it self infiltrates the gaps between the layers of the print, producing a very nice smooth surface. The material is not a UV protection material. According to the manufacturers, they suggest priming and painting the object for UV protection. The XTC-3D is easily primed and painted. So, I’ll be using painted ABS. As far as the warping, I’ve seen this with Alloy 910 on large parts. The Cura Profile is the most up to date, but the parts warp easily if they are large and have holes for screws. For rigidity and durability, it seems ABS is best for outside use. Inside use I am finding PLA to be sufficient.
In response to amcbride, I looked at the Inova-1800 quite closely. But was steered away from it in favor of the ABS. The nylons are very UV sensitive. I had a water distribution system for my outside plants made of nylon tubing and brass fittings. The first year they worked very well. The second year, they all broke due to UV exposure making them brittle. I switched to a drip irrigation system from Lowe’s and that has withstood the time and UV. In fact, I’ve modified some of their fittings to make water distribution easier. So, I would stay away from outdoor use of the Alloy 910, unless it is in use in a place that does not see sunlight.