She did a VHS tape for Playboy back in the 90's. It had two WAM segments on it. In one, she covers herself with mud, in the other with paint. Both are long, and great! I have the original video, don't think it was ever released on DVD, sadly.
I have that video as well. It was produced and shot in a horrible way. The video was shot entirely on low quality grainy looking video. Every scene is either grainy black and white or in soft focus fuzzy color. I think this was done deliberately to mask her appearance, because she looked totally emaciated but was sporting her new breast implants which looked terrible.
Sadly there are no great wetlook scenes of Farrah in her lifetime. The closest was in the 1996 tv movie "Dalva" where she is in the lake in a dress, but that scene was not shot very well either and avoids any money shots.
Farrah was the hottest actress, in the late 70s. And yes, I had that iconic poster of her hanging on my wall when I was a kid. The only reason I watched Charlie's Angels was to hopefully catch a wetlook scene of Farrah but, I would be sadly disappointed, as there was never a great wetlook scene of her.. Yeah, I know there was that prison escape scene, but the prison outfit sucked and the scene was shot dark. I guess Farrah didn't want to get that famous hairdo wet.
I do remember one meh wetlook scene with Cheryl Ladd. I think it was some lame gator wrestling scene, if I am correct. And there was one decent wetlook scene with Kate Jackson jumping into a lake with a bomb. She wears nice jeans, but what I find disappointing was during the entire run of the show, those three women always dressed in great outfits and heels, except in that one scene. I always hated that of many 70s shows. The women were always glamorous except when theres a scene where they might get wet or messy, then they wear more casual clothes for the wet and messy scenes, like they could predict the future. "Oh, I better wear jeans today, because later I'm gonna get in a catfight and land in a pond or mud hole and I don't want to ruin any of my nice dresses". Ugh!