New PolyWhey Waterbased Finish

[johnnparchem]

Looks promising. John P may like this as he gets blue with TC.

I did good with the old ColorTone WB which I was told was EM6000, it was just EM7000 that turned blue. Although polywhey seems intriguing, when I looked at the posts in the above mentioned forum one of the test applications sure seemed a bit blue to me. Maybe I am just a little sensitive to that color now.

I am even considering Nitro. I do have a properly vented spray room with an explosion proof exhaust fan. I have a gallon of EM6000 that I am going to try on a test sample first.

I have yet to see a WB acrylic that did not have a blueish cast when compared side by side to a conventional solvent finish, this includes the new industrial catalyzed water bornes as well. Adding some amber toner helps but side by side I can still see the differences.

unfortunately sometimes one does not need side by side :) I am sure this was mostly my application, not totally the product.

[Darryl Young]

My understanding is that the acrylic used in water based lacquers is what causes the blue tint and there is no way to eliminated it completely. It shows up when used on darker woods and isn't likely noticable on lighter woods. The water based urethanes (PolyWhey and KTM-sv) don't use acrylic so don't have this issue. I think I'll try calling the factory today and see what they say about PolyWhey curing over oily exotic hardwoods.

[Darryl Young]

I called and they said they've had good luck with this product curing over oily tropical hardwoods. With that said, they haven't tested all of them so they recommended a test before spraying a guitar. They have used it on teak and bubinga with good results.

They said the whey (byproduct of cheese production) used in this product gives it very good adhesion properties. They thought it would stick very well to an epoxy finishing resin.......but like every other mfg I've talked with, they always recommend testing before using it on a finished product.

So I have some on order. They did say that their gloss furniture version has a slight yellow tint. They also said they would send me a wipe-on version that is thinner and it is crystal clear. They said that the wipe-on version could be sprayed if desired. For whatever reason, he seemed to think the wipe-on stuff was a great product and thought I would be very happy with it (maybe because it's more clear, not sure).

[B. Howard]

My understanding is that the acrylic used in water based lacquers is what causes the blue tint and there is no way to eliminated it completely. It shows up when used on darker woods and isn't likely noticable on lighter woods. The water based urethanes (PolyWhey and KTM-sv) don't use acrylic so don't have this issue.

This had me wondering, so I contacted the maker. Polywhey is a waterborne urethane /acrylic blend. Main differences are in the way it crosslinks due to a natural protein binder versus say an amino alkyd. That has more to do with VOC's and HAP's than it does the actual coating formed. So as with all WB acrylics I would expect some blueish tint.

[Darryl Young]

If it has acrylic, then I agree. Alternatively, KTM-SV does NOT have acrylic so no blueish cast. I wonder what percentage is acrylic and how much is urethane?

Obviously, I misunderstood them when I was on the phone (or they misunderstood my question). Actually, this helps explain why PolyWhey would cure slower than a urethane product (KTM-SV).

Since Larry is posting and answering questions on the OLF, I'll ask him.

[B. Howard]

Darryl, FWIW, I remember using solvent base acrylic lacquers in years past that did not have a blue cast. Not sure it's an acrylic thing, I kind of always thought it had more to do with the reliance entirely on glycols for carriers in a water based solution, But I really don't know that for sure.