Hey guys, you're going a bit overboard - so take it easy with the truck-in-the-ditch analogies... after all this guy may have his reasons for looking into linseed oil paints that you may not be aware of. Too many historical archives - and now environmental support - not to consider linseed oil IMO - and it does have its merits in this particular field. Trouble is transportation regulations may limit the amount he can readily get, but that is just a question of cost.
It may not be the best technology - but it is cost effective - in a DIY sense. I only had the chance to formulate one linseed oil paint for something like a buck a gallon, but that was in the eighties. But the product was fine.
I'm certainly not a proponent for everything to be done for the sake of "DIY" - but this a case where I applaud someone's investigation into a proven technology. I wouldn't discourage that...
If the OP had a wooden gutter, or wooden ladder, or an old previously coated with linseed surface or some such project, I would also be on the "Linseed Express"
However...this person has been told an absolute lie...that other coatings won't match up to a linseed coating that will last 50 years
The statement that linseed oil will last 50 years is an absolute load of crap
Don't get me wrong...I come from a long line (approaching 400 years) of Swamp Yankees...I've plenty of ancestors that will attest to the "long-lasting value" of linseed oil
But these are the same Puritan-Based Swamp Yankees who feel it's a "waste of money" or even "papist" or "extravagant" to paint a barn
These are the same people that won't tear down a failing structure...tourists think it's quaint...it's really dangerous...and cheap "it'll fall down eventually, why spend the energy/time/money to take it down"
Linseed oil n this case (the Op's) would be an good option...on many (or any) levels
It will not last 50 years
This person has been told a load of crap
If the OP wants to use linseed oil, that's fine with me
It has it's advantages
But do it with open eyes
Linseed oil finishes do not last 50 years on exteriors w/o maint.
Trust me...if that were so, I'd sell nothing but linseed
...and I'd have the whole of Cape Cod as my customers