I took your advice and used the pump sprayer for stripper, applied full strength, generously, made sure it did not dry, scrubbed it after 20 minutes and then power washed it off at 30 minutes. It was partially stripped so I repeated the process. I have about 450 sf of deck and stairs and have used half a package on this small area applying generously two times! At this rate it will take a lot.
The random small area in the last photo on a stair was just sanded, no stripper, as a test. Please let me know what you think, or if it’s something I just have to bite the bullet and hire a professional ($).
We will reply to your comment shortly· 05/20/2019Are you using the stripper additives? These are designed for difficult to remove coatings: https://www.twpstain.com/wood-stain-strippers/rad-stripper-additives
You can let the stripper sit on the wood for up to an hour to loosen up the stain. Keep misting it with water from drying. It is coming off and it will be much less expensive than hiring a pro to do it if you have time and can be patient with this hard to remove coating.