This is probably an age-old remodeling question. I am installing vinyl replacement windows for aluminum single panes. All are exact size replacements. I am cutting back the hardboard exterior siding on all four edges about 3 inches (to get to old nailing flange) and will trim out after new installation with a Prime Trim hard board trim ripped to width. Because the new windows set in deeper than the old windows, I have to cut about an inch all the way around on the interior drywall wrap so that the windows will set flush on the interior. Despite thinking that the interior window opening appeared pretty square, I am finding that some of the finished openings are out of plumb as much as 1/4 to 3/8 from top to bottom. I am making sure that the new windows are installed perfectly square, and there is no shimming issue since there is a solid nailing surface (studs) on all four sides. My question is what to do on the inside, since the existing drywall appears out of plumb to the new windows. Short of ripping out the drywall, and reinstalling new drywall that is shimmed out to be square, I don't know what to do at this point. Any suggestions?

I've got an exterior wood door, approx 1.5" thick, that is starting to split along the side and bottom sections. The widest crack is about the width of a fingernail, but you can see light through it. The door gets direct morning sun, in Phoenix, so I want to use something as durable as possible. Other than standard putty or caulk, what's best to use? I'm thinking something along the lines of an epoxy would be durable and prevent the cracks from getting larger.