I used 'halfords truck bed liner spray paint' but I'm not sure they sell it any more. Halfords, just in case you don't know, is a chain or motorists centers here. They used to sell spare parts, but they are very limited these days. Specialisms seem to be paint, batteries oil, wiper blades, tools (kept in glass security cabinets) and car based farkles which todays yoof seem to like. If you buy a light bulb or wiper blade, they will cheerily ask you if you want to have one of their 'trained technicians' fit it for you. For a fee. You'll often see these guys struggling to gain access to bulbs on cars in the carpark, while owners look cluelessly on. In my view this shows a terminal erosion of the very fabric of society, when a grown man has no inkling of what is happening under his bonnet (hood) or how to change a light bulb on his car. We are doomed as a race!
Anyways, I digress. I can't believe this is a 'special Halfords paint brew' so I think anyone who, sells truck bed textured paint has pretty much the same thing!
Hope that helps!