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  Topic Review (Newest First)
08-03-2012 11:57 AM
Re: ps 31 water tank leak

Finally got this finished...I ended up only doing the aft tank lid. I used 1/2" plexiglass-clear so I can see the mold growing. That ran me about $425 including an inspection/access port.
04-13-2012 08:38 PM
Re: ps 31 water tank leak

I replaced my leaking original plywood aft tank lid with 1/2" PVC. Traced the old one, cut out a new one from PVC. You need a router to make the round-over on the edges. Installed according to instructions obtained from this site. One word of caution: be sure to dry fit everything before you set it in sealant. Be sure to use good sealant, and I used a PVC primer, too. I took the opportunity of making a new lid to add a couple inspection ports. So far (3 years) nothing is leaking (knock on PVC).
04-12-2012 08:50 PM
ps 31 water tank leak

Thanks, all. Looks like replacing the lids is the way to go.
04-12-2012 06:59 PM
Re: ps 31 water tank leak

The water tanks are made up of the hull and the inner liner with a lid.

Originally Pacific Seacraft tops were plywood. By 1989 they had switched to PVC. If the new Pacific Seacraft is making them out of fiberglass that is good to hear as the PVC ones have issues with sealing to fiberglass liner.

To attach the PVC tank lid Pacific Seacraft provided the following instructions:

1 Prefit PVC tank lid on hull liner tank flange making any adjustments necessary.

2. Prefasten lid with #8 x 1 inch counter-sink flat head sheet metal screws with finish washers making sure that there is a clearance hole for the screw shank in the lid. Screws are to be positioned at all corners and psaced on approx. 6 inch centers

3. Unscrew and release lid

4. Remove any residual mold release was from the hull liner by using interlux 202 fiberglass solvent wash or a soap and ammonia solution in way of the tank lid flanges.

5. Sand the liner tank flanges with 100 grit sandpaper.

6. Repeat procedure 4 cleaning up thoroughly so as not to contaminate the potable water tank.

7. sand the inside edges of the PVC tank lid to a width of appox 1 inch with 100 grit sandpaper

8 Apply sparingly a thin coating of Dow Corning ROS Prime Coat (or Eauivalent) to the sanded surface of the PVC lid and leave to dry for 15 minutes.

9. While Primer is drying run a continous beed of Dow Corning 999A Clear Silicone.

There may be more but that would be on the second page of fax which I don't have.

On my boat they did not apply the prime coat, so the tanks all leaked over time. I followed their instructions and the tanks still leak if over-filled.

Tanks lids made of fiberglass which would then bond with the fiberglass liner would be seem to be the ticket.

Marc Hall
Crazy Fish, Crealock 37, Hull 207, 1989
04-11-2012 05:35 PM
Re: ps 31 water tank leak

I just completed this project on NiftyNickers,the plywood top on the v-berth tank was leaking and I replaced it with 1/2" PVC from McMaster-Carr.Nothing sticks to Starboard so it"s not a good choice.I used non-toxic aquarium sealant also from McMaster-Carr for the sealant.
Good luck,
Dianne and Chuck Burke S/V NiftyNickers C37 #139
04-11-2012 05:26 PM
Re: ps 31 water tank leak

I thought the plastic lids were made of 1/2" PVC. If you Google you can find lots of suppliers for this. McMaster-Carr for one. I know it is available on Amazon as well.

My thoughts on the plastic tanks is that you would loose a lot of volume and incur a lot of work with fittings and fitting in general. Just cut a new PVC lid, caulk it and screw it down and you're done.
04-11-2012 05:20 PM
Re: ps 31 water tank leak

pacific sea crafts make there tank lids out of fiber glass . i used one on my holding tank.that ps made. it fit did not have to trim it .4200 sealent and use the screws that match the tank lid you have know as a templet for the screw holes in the new lid from ps. the plastic lid will split around the screws holes. my boat is a 37ft ps hope this helps
04-11-2012 04:39 PM
ps 31 water tank leak

I'd still like to hear about any plastic tanks out there, but where did you source the acrylic sheets?

04-11-2012 03:55 PM
Re: ps 31 water tank leak


My boat has acrylic lids (caulked and screwed down). You can use the plywood lids as a pattern and simply use a router to copy them in acrylic. I think starboard is overkill and your guy is right: nothing sticks to it.

04-11-2012 03:51 PM
Re: ps 31 water tank leak

Still working on the water tanks....I am waiting on a quote from Thumper at PS for the prefab plastic tank lids and have looked into starboard-this item is not loved by the guy helping me with some of the work; his complaint has to do with its apparent inabilty to accept caulk without being screwed down...his issue, not mine since I have no idea.

I searched the threads and haven't seen that anyone has just pulled the old wooden lids and installed prefab plastic tanks into the cavities and then put plywood over top without sealing it. I realize that I would lose some capacity if I couldn't get a perfect fit and would have to secure the tank, but does anyone have any thoughts or have tried/seen this approach?

Thanks for the help!

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