Hi Pete, Plastic welding is the way to go. I tried various ways to repair tanks, but my welded repairs (I fixed 3 tanks now by welding) have had no problems. Plastic welding is rather easy to do. The key is getting good plastic welding rods. I normally use a hot air welder, but if you are very careful, you can use make due with a propane torch. Though I highly recommend borrowing or buying a welder. Harbor Freight sells a reasonable welder for about $60, and since they always have 20-25% off coupons, it would cost about $45.
Small leaks are easy to fix. If you have a more serious repair, like a long crack due to poor structural support, then repair and split it with some 316 stainless mesh. I purchased a package of 1/8" LDPE welding rods from Grainger. As I recall, it was 50 rods for $15. I also purchased 316 mesh from Grainger. I have details on my blog. Below is the link. Skip down to the section on plastic welding. http://svjohannarose.blogspot.com/search/label/WaterTankRepair - Paul E. 1981 C&C Landfall 38 S/V Johanna Rose Fort Walton Beach, FL http://svjohannarose.blogspot.com/ > On Sep 7, 2019, at 12:00 PM, cnc-list-requ...@cnc-list.com wrote: > > Message: 2 > Date: Fri, 6 Sep 2019 22:31:13 +0000 > From: kelly petew <kellype...@msn.com <mailto:kellype...@msn.com>> > To: "cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>" > <cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>> > Subject: Stus-List Water Tank Woes [again] - Welding Question > Message-ID: > > <bn6pr07mb350617d6994a117c6619a6fdc1...@bn6pr07mb3506.namprd07.prod.outlook.com > > <mailto:bn6pr07mb350617d6994a117c6619a6fdc1...@bn6pr07mb3506.namprd07.prod.outlook.com>> > > Content-Type: text/plain; charset="us-ascii" > > My water tank is leaking again. I want to attempt a weld to repair it. > > It is a Kracor polypropylene tank, but the labeling details have faded over > time, and no longer legible. I don't know what kind of polypropylene was > used to construct the tank. > So, the question is, do I use hi-density OR lo-density polypropylene? Or, > does it matter? > > Thanks! > > Pete W. > Siren Song > C&C 30-2 > Deltaville, Va.
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