Is there any product I can coat electrical connections ie grease Vaseline to protect from moisture

Vaseline is about the best product you can use for protecting electrical connections against corrosion from damp. I use it all the time.

Dielectric grease (silicone grease)

Vaseline doesn't like high temperatures and over time will "run/migrate" and it does conduct, albeit very slightly.

Dow Corning DC4 (as above) a non-drying silicon dielectric grease works up to about 200 degrees (Celsius)