Micro products seem to work OK on WNW decals, by all accounts and I know from reports from our customers that they also haven't so far caused any problems with our own decals but none the less, as a decal designer/manufacturer these patent potions make me nervous. The wetting agent (blue label ) is fine, as it simply breaks the surface tension of the water and allows easier movement of the decal (a drop of diswashing liquid in the decal water serves the same purpose and is much cheaper!) but the red label solvent actually works by dissolving/softening the printing ink and as such the scope for damage is obvious. Some other decal setting agents are much more aggressive ("Champs" and Humbrol Decafix, for example) and really shouldn't be used with Pheon decals or probably WNW ones either. If in doubt always test on a spare decal first or, far better, use heat to settle the decal from a hair dryer and/or a towel dipped in hot water: quicker, cheaper and more controllable. I really don't understand why this technique isn't used more widely; perhaps if I bought up a cheap batch of hair dryers, labelled them as the Pheon Decal Setter and sold them for fifty quid a pop....... now there's an idea! I once tried to compute how much cash has been made by "Micro" selling their sol and set and I'd not be surprised if they have made more out of those two little bottles than all their decals put together - how many modellers don't have them on their bench? Great marketing.