Spot on dewi - easy bit of detective work for you too - well done,
For those of you who like to use Flecktarn the time that it is most effective is fast approaching - so get out there and use it!
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If you're getting it printed to the canvas, you need to enquire which ink they are using... there are certain so-called eco inks that are not very durable. Also, you may get a better effect for what you're after by asking them to lower the resolution of the print... it will pixelate the image, perhaps even blur it... but it will be more effective camouflage at a distance than a defined high resolution print would be (bearing in mind that camouflage is less effective the closer you get to it usually)
Should you wish to avoid canvas altogether and go for a waterproof material... you could always have the print done onto banner material. Depending on the grade, it is tough and durable... and with a quality supplier, you will get reinforced eyelets ready to use.
A few years back banners were printed with solvent inks (bit stinky, but effective) although the main manufacturer for the solvent printers went out of business in a spectacular fashion. It might be that you're looking at eco-solvents or maybe even thermal printing now... but you can use a product called Frog Juice that will increase the durability of the print and give it some protection against UV light and the weather.