Find out where the water is coming in at. Maybe reseal the cover. Are you sure the water is coming from rain causing the problem or could it be things are getting put away wet? I tried getting a semi custom cover for my boat and it fit horribly. I ended up with a $99 BPS cover and nothing inside the boat gets wet.
If it is just a little moisture problem, not really rain that is causing the problem you can get some packs made to absorb water to put in the compartments.
A cover shouldn't do a decent job. It either works or it doesn't and if it doesn't then you will start having long term issues. I also bought one of the temp carports from Harbor Freight for $99 to park under and with minimal improvements, it does a great job. Not sure if that is an option for you or not.
Edited by Bobby Milam (08/26/17 12:51 PM)