Answers

You need to have a local contractor take out and re-install or install a new door.

I really do not have a clue. Try calling a few log home builders for their thoughts. Maybe Ebay.

Yes, along with a good wash to remove any dirt and dust first.

Remove the old and use the Deckscapes.

Start scrapping and sanding.

Follow the label.

I’m sorry, I do not.

you need to put a least one coat of interior stain on them. I know its to late, but bleach should never be used.

I always say to budget $1 per square foot of house / per year for maintenance. You need to keep the finish up. Once it fails you are into big bucks to strip it off and refinish.

If you have carpenter ants you have wet, rotten wood somewhere. Fix the rot the ants will go somewhere else.