I don't understand why rattle can paint would fade less than paint in a 4 litre can but...... it could depend on the thinners used and the percentage.
It often pays to test these things before opining that a fellow Perentie/mil LR enthusiast is outright wrong
I'm surprised that you think i suggested that someone was outright wrong as I didn't.
The colour of the sleeve on the can and the fact that Protec list a light tan was my initial concern.
I'd also read that the military paint supplier had changed in the past and, for example, that the Protec green wasn't 'correct' but that was probably Series II rather than Series III.
The light tan may be a better match but the Brown isn't far off allowing for fading on my Series III FFR.
The data sheets for both the 4 litre & spray cans list IRR properties.
Colin