MB Quart makes some pretty legit Marine grade stuff. I am currently running their 6 channel amp and it gets soaked almost daily. On top of that, I live on the ocean, so ifs bathed in salt from the air 24/7. Never had any issues.
91 YJ, 350/700R4/231, 8.8/HPD30 with 3.73s, 6" SOA with 38" TSLs. If I ever see the previous owner again, I am going to curb stomp that meth-head brain dead crackpot.