Gas Tank Sealant

[10717]

Sorry if there are other threads on this–I don’t have the best luck with searching. I had a Johnson K-45 aluminum gas tank straightened; the person who did it recommended coating it with a sealant before using it. There are a number of sealants on the market, but KBS seems to get the best reviews. I wondered whether members had tried this brand (or others), how well it worked, and how difficult it was to apply. Thanks.

[green-thumbs]

It depends upon the type of tank…2 piece cast aluminum tanks (such as on Mercury KD3 are resealed by splitting the tank, cleaning up mating surfaces, cutting a gasket and applying a sealant/adhesive to gasket and
mating surfaces then fastening halves together (less all the details)
Other types of tanks can be made leak tight by use of what are called
“slosh & seal” which are liquids poured into a clean tank to form an inner
layer to seal seams and pin holes. There are also products applied to
exterior of tank
The cure varies depending upon the doctor , the patient and the hospital, . My patients have all been 2 piece cast aluminum tanks.

Model A Ford on line parts vendors offer a product to reseal the 11 gallon tank, so more than enough to do several outboard tanks. Those
with experience can say more about their experiec with slosh and seal.
Louis

[sydinnj]

Do not recall the names but I have used the slosh and seal sealers for years. My first time was on a Johnson A 25 , so similar to your tank style, about 40 years ago and it still works. That one was a yelliish green color and I have also used red color ones. Take out the filler cap and the shut off valve use something to plug the outlet that will not hurt the threads. Have the tank as clean as you can inside and dry. Put your filler in and tape the opening. Slosh it all around a few times then pour it back into the can and give it a couple of minutes to drain. Then let it dry. I will normally give it at least 2 coats

[Mumbles]

POR-15 and KREEM are two good tank sealants which come to mind.

[lindy46]

Por 15 works well. I used it to seal the tank on a 1947 Sportsman and it sealed pinholes and was still sealing after several years.

[lyks2tinkr]

Damon Red Kote is the sealant I have used on steel and aluminum tanks. Unlike other sealants redkote stays flexible.
Follow the instructions and you’ll have great results. Thinning with some acetone and using 2 coats is the method that works best for me. A quart will do several outboard tanks.

[crosbyman]

..side issue are these sealant any good for floats ?

Joining AOMCI has priviledges 🙂

[sydinnj]

If your talking about sealing a carb float I would think they are too thick and heavy. The red kote is one that I have used on tanks and works great

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