I love acrylic (water based) polyurethane finishes, they have almost no polyurethane in them though. The ease of application, the resulting appearance, and the wash-ability is what I like. Is it just the heat resistance you find a problem?
Thank you for responding.
If you insist --
1. Double the cost (at the hardware store; I didn't notice an "acrylic" option).
2. Half the resin, at least. I used an entire quart to barely finish the work table.
3. It goes on thin, because of its somewhat low viscosity and high solvent fraction. I used like five coats. I probably sanded off almost as much as I painted on, each time...
4. It's not as strong as oil-based products. It scrapes away easily, and it's oil sensitive(!). (There's a somewhat rubbery spot beneath my mouse.)
5. It looks milky, both when going on, and after drying. It's not very attractive.
1. It is expensive, for me about 130-150% of the cost of the organic solvent type. All the water based ones contain acrylic whether the label says or not.
2.&3. I apply 6 thin coats! the first coat uses the most as the pores in the wood are still open. second coat is about half as much soakage.
thereafter each coat goes on in an extremely thin layer with a foam applicator which I put in a plastic baggy when not in use.
Each coat takes about 20-25 minutes to touch dry and the next step (at 50% humidity and room temp. )
I sand all the rough spots lightly with something like 150 to 220 grit after every odd coat, ie, 1 3 and 5. very little finish is removed.
I follow sanding with a wipe down from a water damped cloth to remove the dust and then immediately apply the next coat.
The damp surface doesn't matter as the finish is water based.
Going from memory a 8 foot by 29 inch bench surface used approximately 250ml or less, maybe 150ml for 6 coats.
4. I can believe it is not as pliable and tough as oil based poly. I haven't encountered the oil susceptibility though, have to test this.
5. Yes it is milky on application, but when I put it on I do it so thinly it is just enough to witness the area covered, it is a feature not a bug. It rapidly clears.
When dry my results are absolutely "water clear" no milkyness and none of the orange cast the oil based ones have.
Your results suggest you are putting it on way too thick in each coat. What I like about this stuff is the low skill level required to get an absolutely consistent mirror finish. It does behave differently than anything else I have used before.