I just jiggled both my old and new bottles and TBH their viscosity is about the same to my mk1 eyeball but thats hardly scientific so when I'm done Alclad coating my various paid build this afternoon, I'll try my various acrylic flow improvers/retarders ( which is what the glycerine does when airbrushing) with new Pledge and post some results tomorrow, I'm hoping you've just got a duff bottle that they've left the retarder out of. First off , Klear/Mission acrylic/Alclad aqua et al dont need ammonia to clean them out of an airbrush , 99.9% IPA will do the job fine after a good rinse and spray through with hot water and detergent. As my brushes are on the expensive side, 5 minutes in an ultrasonic cleaner with detergent/water guarantees no nasties left behind, that and the amount of neat cellulose thinner/gun cleaner going through them regularly will shift anything... Final word, reserve the Pledge/Klear for canopies and decalling, shove a 0.4mm needle in your airbrush , get you some Mr Color super UV cut gloss, Mr leveling thinner an extractor and a respirator then glass like finishes like this are yours, effortlessly:

The Johnson Future product (or any of its previous incarnations) has not been available in my country at all. After a lot of digging around online and in hardware stores here in New Zealand, I discovered that there were many floor cleaning products but actual floor polish seemed to be absent. Eventually I found one large hardware chain that sold its own brand of floor polish, so I bought some to try. In the bottle it is a milky colour, but it promised a clear shine, so I tentatively tested it on a model I was building. It was great! It dried to a clear hard finish, though not super glossy, and I've used it ever since. The comment about it being frozen is a red herring, that was to do with with some internet hype last year when Badger found deliveries of Stynylres left on people's doorstep in the US blizzards ended up turning to sludge and offered replacements. Hence according to internet wisdom ,all modelling products now are ultra sensitive to cold and everyone is living in Antarctic conditions with our parcels turning into icicles on our glacier covered doorsteps... 🤣Spraying is easy, 75% Pledge 25% 99.9 IPA 5% Glycerine ( approx). In my case I normally use Mr Color GX UV CUT/Mr Levelling but i've tried this on a few customer builds with Alclad NMF ( t hat really doesn't like lots of lacquer thinner on top) and it dried to a nice hard glossy finish without problems in about 3-4 hours in a room at 18 Centigrade/30% humidity. For spraying I use an Iwata HP-TH with a 0.5mm needle at abut 15 PSI. Any chance of pictures to show this and equipment you're using?...A little evidence goes a long way. I never believe any internet content unless I can see the evidence of the results and the actual tools /materials in the possession of the person giving said advice. You'll see others brands such as "Mop and Glo", etc.; but I'd avoid buying anything that is milky looking in the bottle. If it's as clear as water in the bottle, it may be useful, but it's also not a direct descendant of Future. Been trying to master Klear also recently. I did two trials one airbrushed neat and one brushed on with an old sable brush. To be honest I was reasonably pleased and both looked almost identical. The surface finish is a little grainy on both but not too bad. After reading the above I’m going to have another go with IPA and glycerine which I assume is 5% of the Klear and IPA combined and added to the mixture. There’s a Boots chemist in York so they should sell it I hope.

B: Second thing I noticed was that its not drying to a consistent finish. I tried a hair dryer to see how long it would take, and some patches of the coated area went more satin, and others more gloss. Giving it an almost patchy appearance.

SPECIAL ISSUES & MORE

I don't tend to build aircraft myself. I have a few 1/48 builds but, two of the canopies had already been painted up. The only one I might apply it to would be a 1/48 helicopter canopy. But yeah I've only ever brush applied the Pledge and so far the new one doesn't seem to like it much at all I continue to read about the wonder of Future floor polish as a clearcoat and easy availability in the US. However, over the pond here in the UK its impossible to find. I went on a mission to find what I think is the closest possible and try it out... "Pledge Floor Polish". First of all, FUTURE, as a brand, was discontinued many years ago. It was bought out and changed names. Essentially, it was a clear acrylic floor wax that people found could be airbrushed or brushed on to provide a clear gloss coat. Thus, what you should be looking for is a clear acrylic floor wax where you shop.