If you had to cut a long miter how would you do it

[Daryl]

Cut the miters the best you can, join the two pieces together temporarily and then run your saw back up thru the joint where they come together. i've done plywood like this and it can make a good and tight joint. You have to be careful with your set up so there is no binding and make sure the two pieces don't move at all.

[sawsall]

Thanks for your help guys I appreciate it. I will give it a shot and let you know how it comes out!

Dan

[johnnysquire]

An extra thought - silverfox is right that the walls aren't going to be perfect, so plan to modify the backsplash once the 45 is tight. Don't try to get the fit perfect on the 45 until the backsplash is scribed and trimmed as necessary.