There has been quite a lot written about the need for additives in modern oil and water based paints.
I personally wouldn’t be without them. But up until now I’ve only been able to source products from Owatrol. These being Owatrol Oil (for oil paints) and the water based Floetrol.
Both these are excellent products and really do aid application and finish of the products.
Recently a new water based additive has arrived here called Zamix Latex Extender formulated for water based paints. It’s not widely available and needs to be ordered through a company called Paintz UK. I think this is a derivative of a Canadian product called XIM Extender, but I may be wrong.
I’ve been using this in a lot of water based trim paints recently, in particular Johnstone’s Acrylic Satin.
It doesn’t look like Floetrol, in fact it looks like car antifreeze, but it will totally transform how the paint performs. Wet edge time and the levelling of both brush and roller marks is excellent. I recently painted a very large interior bay window board which can be a challenge with acrylic paint if you are not extremely quick. But the Zamix allowed me to briskly cut round the entire sill then roll it with a 4.5" Wooster Micro Plush sleeve and get no dry edges or lap marks. It also left little roller stipple when dry.
You don’t need much but you may need to add more product throughout the day to keep the flow.
If you are looking for the finest finishes with acrylic trim paints this product is well work seeking out.