My mom's house was recently vandalazed, and the door was kicked in. Her solid wood door now has a 2 foot crack that you can see sunlight through (vertical, runs with the grain). Does anyone have a product they have had good results with to fill this crack with?

 

Welcome to the forums!

Is the door painted? or stained?

Caulking is probably the easiest fix.

 

Epoxy putty.

Your mom's door will be stronger than before the fix.

This is 2-part stuff. Initially, it's sticky and just thick enough not to sag as you work it. I would cram the open crack with this and then immediately clamp the wood tight. It begins to harden in minutes - first, jelly-like; next, like rubber you can trim with sharp tools; finally, a hard tough plastic you can sand, paint, even drive screws into.

I use it all the time when replacing hardware and restoring doors and windows.

The stuff sold in cans as "autobody filler" comes in either gray-pink or gray-blue. There is also epoxy putty sold in stick form, coloured brown for wood. It is already half-hard, so does not bond so well.

EDIT: Oh, if you use the brown stuff kneed it with some plastic bag between it and your fingers, or you'll have residue stuck in your fingerprints until that layer of skin grows off.