Using Future over Gunze Aqueous acrylics

Future is nothing more than an acrylic coating, however if the Gunze isn't completely cured (as opposed to merely dry) there is the chance that it can reactivate the paint. Gunze and Tamiya are virtually the same paint, and I've never had an issue putting Future over Tamiya, as long as it is fully cured.

Any gloss coating can and will darken any color.

While I don't  use Gunze, I know many who do, and I've never heard any of them mention such a problem. From the description, I would surmise the following:

1. Typical of many modelers, the poster probably didn't wait for the Gunze to cure, either because they don't know the difference between "drying" and "curing," or they didn't know that gloss coatings often take longer to cure, or they were just impatient.
2. They reduced the Future with Windex or some other completely unsuitable solvent or solvent blend, like windshield washer fluid. I've warned people about this many times.
3. They reduced the Future with 90% isopropyl alcohol, denatured alcohol, or ethyl alcohol but used too much. I think the most I've ever reduced Future for spraying was 10%. It was 90°degrees that day, and my workroom is unairconditioned.
4. Any or all of the above.

I suspected as much...not allowing it to cure would seem the most likely culprit and I've never heard of Future, which is pretty inocuous by itself, having this effect on any type of paint before...provided it's used properly. What the poster is describing seems to be that the Future is bonding with the paint, which seems to me can only occur if the paint isn't fully cured. Thanks for the info guys!

allowing a day of drying before apply another layer shall be a good guideline.

I never have a problem regarding applying over another layer with different paint after a day of drying.

batai37

 What the poster is describing seems to be that the Future is bonding with the paint, which seems to me can only occur if the paint isn't fully cured.

It may also depend on where the poster of those comments is located. Around the world, there seems to be a number of "Future equivalents" which aren't quite the same formula as the original and contain cleaning agents  which may have an adverse effect on the underlying paint.

He may also be seeing some darkening of the original colour when the "Future" is applied, an effect which I would characterise as normal of any gloss coat when applied to certain colours in certain situations.