We used about 35 gallons of linseed oil for our 500 foot sqare earthen floor. This was over the course of 4 or 5 coasts. It is harder to say specifically how much 'per coat', as the cob absorbs the linseed oil much more rapidly at first. I would reccomend thinning the linseed oil with citrus thinner for the first coats, to get deeper penetration. Maybe like 5:1 ratio. For the final coats, we added beeswax to the linseed oil, which I would reccomend.
We sourced our linseed oil raw, from a company called Montana Vegetable Oil. This was 8 years ago, and they may not be in business anymore, I havent been able to find them lately. The oil came in 5 gallon buckets and was vastly more economical than purchasing in smaller quantities from natural building type suppliers.
There are true experts on this stuff though, unlike me, and I would definitely consult with one before you begin. Lots of ways for things to not quite turn out right.
n taylor-
I dont recall how I found the company, sorry, it was 8 years ago and there has been alot between my ears since then. as for cost, I recall it being dramatically cheaper buying it direct from the agricultural processor. price was maybe about $40 for 5 gallons, plus shipping. I am sure it is much much more expensive now, as everything building related and agriculture related has really skyrocketed in the past five plus years. I edited my earlier post with some info my wife remembererd so re-read that please.
hope that helps-
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