Does the Tarrago product change the color or texture of the suede at all ?
I've been using a combination of :
1. Saphir suede treatment, and
2. Not wearing suede if rain is forecast
RogerP is my mentor concerning the use of this product on suede, so I'm comparatively inexperienced. But I can tell you what I've found from my use of it on perhaps 5 pairs of footwear.
It seems that Tarrago possibly can
suede slightly. But I qualify the statement because if it has, it's so very slight as to make me uncertain if it did at all. But I can also say with more certainty, that if it does, other suede remains entirely unchanged. I know Roger has said that it can slightly darken lighter suede and I defer to his more extensive experience. But I have a pair of moderately light rust colored nubuck oxfords, and interestingly, they seem not to have their color affected at all? I also have a pair of darker green Sanders with plush nap, and those too seem to be unaltered.
I had an older pair of very dark brown chukkas from Brooks, and oddly, they perhaps are the only footwear in which I'm fairly certain there was a darkening. But it may be because since they were older, even though I brushed them rigorously to assure they were clean, they still had enough particles to impair the absorption of the spray. (Roger noted it's best used on new footwear.)
While I"m convinced this product is as effective as reported, I admit to still being wary of wearing suede in really bad weather, but certainly lighter showers have left them all delightfully unaffected.