Answers

I like the Life Line Ultra 7

There is no clear product that will protect the wood. You need something with a pigment to help block the UV to stop the house from turning black.

Perma Chink Life Line Ultra 2 or Ultra 7

NEVER use bleach. They will need to be sanded.

Call Dave at 800-564-2987 for help and products

If you can find straight enough ones any one of these species would work. Yes, I would recommend stripping the bark off.

Sounds like it needs to be media blasted and start over with new finish

Sashco Transformations stain ”says” that it can be applied over stains that are non-identifiable.

Give it a LIGHT bath with Log Wash and apply a good coat of Shell Guard borate. Call 800-564-2987 to purchase and get more help.

I would guess yes.