Bedec Barn Paint, a bit spendy

[badabec]

Hello, my timber clad oak framed double garage needs repainting. It is quite large, 17 feet tall at the ridge. It also has a cart shed attached. I used Bedec the first time around. I need at least 20 litres, or well over £200 worth.
I'll be using an airless spray gun.
Has anyone any suggestions for something a bit cheaper? I've seen some acrylic black barn paint on ebay for around £80 for 20 litres, could be carp?

 

[Turbo]

I did a post & rail garden fence and our hen house with this stuff.
https://www.duluxdecoratorcentre.co.uk/cuprinol-cladding-fence-opaque

Goes on like oil based gloss paint, covers very well & it seems to be weathering well. I applied it with roller & brush, don't think you can spray it as it is a gel type paint.