This product has stood the test of time for sure...
I've had mainly good success with HD-80. However, with Sikkens, I have had mixed results. Sometimes it strips off like a charm, and other times Sikkens will laugh at the HD-80, and not budge. And one other time, Cabot's semi trans gave me a fit. I was able to remove most on the floor, but the railings would not strip.
Ditto on the HD-80. It's about the only thing that will remove CWF-UV also. I live real close to Russ and will use his stripper next season. I like the EFC-38 cleaner also. It will take off failed sealer and leave an intact sealer alone. This is beneficial when cleaning solid stained decks. It tells you where the weak spots are.
I use hd 80 often on decks. it is a good product.