I picked this product up for some light spray painting. I cannot recommend protection more than enough and this is adequate for my use. Please remember to use a eye protection too!
I work in 3d Printing and processing prop's/models. I've used many fillers for different applications and situations.
I honestly prefer Squadron over most others at this point for it's ease of use though there are a few cravats to this.
Smelly - IE fumes. There is significant off gassing from this product make sure you are in a well ventilated area when using it.
Sanding - Wear a face mask. This is not optional.
Gloves - Wear gloves on applications or use tools.
Bad batches - In the past I have had tubes where they have separated into a clear gel and think sludge. Often this is older ones that have sat on a shelf for too long. You can kind of mix it however it is pretty hard to get the right balance once this is happens.
That being said, the finish is fantastic. Primer sticks perfectly and I have not seen any paint peel from props. The quick dry lets me get on with the work quickly and effectively. Brilliant for prop makers.