Originally Posted by Ftoast
Because you're lowering the translucency by adding more flat-white instead of lowering water percentage, I'm guessing the water is important for thinning the viscosity (and lengthening dry-time I'd assume) even for a rolled app?
Or could water be safely lowered by this point?
If the water is left at it's current proportion, but the Paint ratios are increased, then one is in effect lowering the percentage of water to paint.
Also one must note that the Poly percentage remains the same.
A very thin mix high in reflectivity is what makes rolling so problematical a chore. Myself, I have rolled Silver Fire...onto Mirrors no less, but I also could take that chance seeing that I just do those sorts of things. It required that I use ultra low nap rollers, and I only use 6" wide rollers. I applied the paint very wet (...a loaded roller...) and worked both the Row and the wet edge just to the point it was blended.
Over working either or both is what results in Roller marks, and can flatten out the surface's reflective particles making them far too Retro Reflective.
To elaborate further, it is the achieving of a balance between the amount of reflectivity in a mix, and it's translucency / masking that allows for the results experienced. Adding more reflectivity means one must also additionally mask a percentage of that reflectivity. When the paint is sprayed correctly, the translucency of the mix allows what reflectivity is produced by the particles to be refracted within the paint and dispersed more evenly than would be the case if those same particles are rolled into place and are present on the surface, masked or not. So if rolling is to be attempted, it must be done with a light touch, keeping the paint wet and as virgin after the initial lay down as possible. (...essentially for the same reasons and in the exact same way one must apply pure Polyurethane with a brush or roller...)
All told, although my own efforts at rolling were a success, it was nerve wracking and a great worry to bother with, and further reinforced my belief that it was not something to advocate to the DIY masses. Too much risk of having to say , "I'm sorry it didn't work out for you."
OH yeah....when spraying, a water thinned mix actually drys faster. When rolling, it's a toss up between getting runs or over saturating a surface. So like I said, the paint goes up very wet....but not heavily applied. To do that you are constantly moving between Tray and surface, keeping the roller loaded just right, working the wet edges lightly......
Sometimes, if you don't use a Gun to start out with, you want to use one at the end......on yourself.
Upping the Metallic content carries a lot of concerns and considerations, and no small amount of risk. Just increasing the amount of Silver and omitting Pearl, the biggest concern I would have is that the paint might push more into the Blue spectrum, so having the recommended Gold to add would be absolutely essential. Do not forget that.