What not to like about PEX, taken from page 6 of next link:"Do not spray on or allow organic (petroleum-based) chemicals, petroleum distillates, termiticides or pesticides to come into contact with PEX pipes, otherwise permeation of harmful chemicals may occur through the pipe wall and contaminate drinking water."

If all goes to hell, I still have a 9-5 that pays well and a degree in chemical engineering.  

You realize that you will be required to bring this house up to the lead standards, which minimally includes visual and chemical tests and inspections (you pay for those). 

The chemical reaction literally cooks it's self into a hard plastic. 

The heat treatment is more expensive than the chemical treatment, but it works better. 

@Raul Nico Ruiz   I used Shawn Huss at Chemical Bank.

My daughter, that just graduated from the University of Arkansas as a chemical engineer but that school charged us $6,000 a semester but we did not take on any long term debt. 

Brick isn’t meant to be painted, and painting it is difficult (lots of prep, lots of coats, has a chemical compound that rejects paint).

Some can even detect chemical composition and contaminates, like lead.

@Yonah Weiss my degree is in Chemical Engineering.