Moisture prevention....

dmax

.
Jul 29, 2018
1,087
O'Day 35 Buzzards Bay
Are you trying to protect the foam? If so, take the foam out, put it in a big, appropriately sized garbage bag, suck the air out of it with a wet-vac (reduces the size considerably), put it back in and open the bag to let the foam expand. You can also wrap plastic sheeting around the foam but the bag makes it easy to put back in. If you're trying to protect the fabric, I guess you need those plastic furniture covers :).
 

dLj

.
Mar 23, 2017
3,818
Belliure 41 Back in the Chesapeake
Moisture may also come from underneath in which case one of the under ventilation type pads often used for beds may help. Depends where the moisture is coming from and the easier solution.... The above method will help the foam but not necessarily the fabric.

dj
 
Mar 21, 2022
124
Bristol Corsair Tampa
Are you trying to protect the foam? If so, take the foam out, put it in a big, appropriately sized garbage bag, suck the air out of it with a wet-vac (reduces the size considerably), put it back in and open the bag to let the foam expand. You can also wrap plastic sheeting around the foam but the bag makes it easy to put back in. If you're trying to protect the fabric, I guess you need those plastic furniture covers :).
No, im just want to prevent moisture from causing mold, ect while im living aboard
 
Aug 28, 2006
575
Bavaria 35E seattle
You can use a small dehumidifier in the cabin. It can run the accumulated water out through a tube into the sink. You can find one on Amazon.
 
Jun 2, 2004
151
Beneteau 393 Lake Texoma, Texas
+1 for DampRid. My boat is in a hot, humid environment- have used the large bucket with DampRid crystals for 20+ years and never had any issues.
 
Jan 1, 2006
7,371
Slickcraft 26 Sailfish
My wife recovered our saloon cushions and she used a water impervious vinyl on the bottom of the cushion. This helped keep the condensation in the boat from getting the foam damp. Also, I think the perspiration while sleeping on the cushion didn't get underneath the cushion to increase dampness. During the day ventilation would remove that moisture. Worked pretty good in the North East. Region makes a difference.