20 yr old deck good condition. Some peeling of solid Behr solid stain.

You cannot fix this unless you fix the root of the problem which is the peeling Behr. To fix it, you have to remove it and start over. This would require heavy stripping and or sanding.

Thanks I was dreading that. Anyway I`ll read about that on here. The only thing I don`t like is will I be able to get all the Behr off . I guess using stripping chemicals and sanders will work, but what about the rails , steps, and spindles? They are not peeling, can I just go over them with a new stain?  It might be too much of a job to tackle right now. Until I research it. Then decide. I know you are right . Thanks for taking the time to respond. My local "experts" said just use Benjamin Moore Arbor at $250 5 gal and you`re good! 

Try a two toned deck:

DECKSTAINHELP.COM "https://www.deckstainhelp.com/why-have-a-two-toned-deck/"

Two-Toned Decks in 2024: Pro Tips, Advice, & Advantages

There are several advantages to having a two-toned deck. Blend the deck in better with the house without having to give up the natural wood look is one benefit.

Thanks for the suggestion! That might work as nothing is peeling on the spindles or rails .Right now I`m thinking I`m going to rent a edge floor sander with coarse grit paper to get as much off as I can, after checking screws and nails. If I can get all of the peeling off I really don`t want to go for bare wood unless the sander will do it. A friend just did this with good results. As I am getting up there and had a recent hernia surgery, If I would rather hire someone to just  strip the deck what would I expect from them as far as time and technique and cost in  CT area 06712 for a 40 X 10 deck? 

Sorry, but no idea what a contractor would charge in your area.

Thats OK . Just wondering. I`ll try to post what I end up doing,and the result. Thanks. I still have alot of reading to do. Thanks for all the information! 

Hi Scott  So I purchased 4 gal of RAD deck stain remover. I only put down about 1/2 gal as a test with a brush. It was like spreading Greek Yogurt!I can imagine trying to spray it.  It came out white but turned clear. I left it on about 20 hrs in the right corner of my deck, but not the step. It didn`t seem to work that well.. possibly I did not put it on thick enough? It did bubble and soften some stain but not enough to clear down to wood. Some areas did not even bubble. So after hauling the power washer up to take of the RAD, I continued to clear away the peeling areas.The pictures show where I am at. So my question now is should I keep going with the RAD remover in spots where there is still solid stain?I can try a heavier coat....or  Do I rent an edge  sander? I`m thinking if I got off all the loose or peeling parts maybe I can just  recoat with solid stain? But probably I should continue until I get to the wood somehow. I was thinking about the 2 tone suggestion .....Any advise on continuing from  my current  point?   Thanks 

I assume you mean the RAD PaintStrip, not the RAD Stain Stripper? Did you test spot first to determine how thick to apply and the needed dwell time?

From Description

Before general use, test on a small area to determine compatibility, required dwell time, and coverage for desired results. For an estimated 5 or less coats, scrape a section of the area with a stripping tool after one hour of dwell time. If not easily down to wood after one hour, leave on longer and test again hourly. For 10 – 15 coats of paint, cover with plastic and wait 24 hours to test. For best results, cover the stripper with plastic and do not allow to dry.

Two tones are great if you want easier maintenance in the future and you can get the rest of the solid off the floor by stripping and or sanding:

DECKSTAINHELP.COM "https://www.deckstainhelp.com/why-have-a-two-toned-deck/"

Two-Toned Decks in 2024: Pro Tips, Advice, & Advantages

There are several advantages to having a two-toned deck. Blend the deck in better with the house without having to give up the natural wood look is one benefit.