To Tank or to Tank?

[s/v Jedi]

Originally Posted by Icarus

Coke is causing death?
Where did you get this data from?

Sugar, let alone high fructose corn syrup, are a big killer in many western societies. Diseases like obesity, and type 2 diabetes are often or for some diseases always caused by high sugar intake and non existent in societies that don’t consume the sugar like we do.

From Harvard University:

The abstract, presented at an American Heart Association scientific conference in New Orleans, linked drinking sugar-sweetened beverages to 133,000 diabetes deaths, 44,000 deaths from cardiovascular diseases, and 6,000 cancer deaths

[team karst]

My plastic diesel tank supplier said to NOT limit sidewalls bulging, but to accommodate it. FWIW.

[Tolly555]

316 SS

[Bridger]

Not sure what safe potable resin is? I emailed Gougoen about it and hear is their response.
We are not aware of a portable water-safe epoxy. We offer a document on best practices for mixing our epoxy on our epoxyworks website called tank guidelines.

If anyone knows of potable safe resin please let me know

[s/v Jedi]

Originally Posted by Bridger

Not sure what safe potable resin is? I emailed Gougoen about it and hear is their response.
We are not aware of a portable water-safe epoxy. We offer a document on best practices for mixing our epoxy on our epoxyworks website called tank guidelines.

If anyone knows of potable safe resin please let me know

Correct, there is no safe epoxy. When you build a fiberglass or composite tank with epoxy, vinylester or polyester, you must use a specialized coating like discussed before.

[Bridger]

Ok sounds good, What is that coating? Thanks

[s/v Jedi]

Originally Posted by Bridger

Ok sounds good, What is that coating? Thanks

I believe there are two options, one based on epoxy and one based on polyurethane:

- Polyamidoamine Epoxy

- Elastomeric Polyurethane

If you search that in combination with potable water tank coating, you will find the info. Or just take this to your local PPG store (pretty sure they have it) or maybe even Sherwin Williams and they can look it up.

I neverhad to use it myself yet, but it’s inside my oem tanks.

[GILow]

Originally Posted by Bridger

Ok sounds good, What is that coating? Thanks

Jotun make an excellent coating for drinking water tanks.

Here in Australia they have two types at least that meet the Australian drinking water standard (AS/NZ4020).

[VChild]

Originally Posted by Bridger

Ok sounds good, What is that coating? Thanks

Sika 291FC and Sika 291LOT (in the color white) are polyurethane sealants that are NSF approved for potable water. Before I decided to replace my SS tanks, I was advised by a Sika factory rep that these sealants are drinking water safe and are ideal to coat the inside of leaking SS water tanks. He recommended a light sanding or scuffing of the inside of the tank before application for the best bond. FC stands for fast cure. He recommended the LOT (long open time) due to the inherent difficulty in applying it evenly inside a baffled tank. He claimed it was excellent in bridging the corrosion pitting. Besides SS, the label says it bonds well to most marine materials - wood, metals etc.

[GILow]

Originally Posted by VChild

Sika 291FC and Sika 291LOT (in the color white) are polyurethane sealants that are NSF approved for potable water. Before I decided to replace my SS tanks, I was advised by a Sika factory rep that these sealants are drinking water safe and are ideal to coat the inside of leaking SS water tanks. He recommended a light sanding or scuffing of the inside of the tank before application for the best bond. FC stands for fast cure. He recommended the LOT (long open time) due to the inherent difficulty in applying it evenly inside a baffled tank. He claimed it was excellent in bridging the corrosion pitting. Besides SS, the label says it bonds well to most marine materials - wood, metals etc.

I used Sika for the tanks on the current boat. Never again. I could taste that stuff for the first year or two. It settled down eventually, or maybe my taste buds died.

I've gone with Jotun Tankguard on the new boat.

[gonesail]

i would go with plastic. your choice.