IPA will degrade the part especially if the part has thin features and/or is submerged too long. Warping, brittleness is a problem with IPA and with some 3rd party resins it will craze the surface (look like a desert).
It really also depends on the part your printing. With a water based system I have found the parts are much more durable and do not have the warping and cracking.
I have been using one of the plastic containers supplied with the printer filled with plain water and I hang a Reptisun 10.0 UVB bulb over it about 6" away for 5-30 min depending on part size and thickness. Cost is approx. $30.00 USD + the water 
You can read this thread Replacing Isopropyl Alcohol with Yellow Magic
Z-vat sells YM and Amazon as well.