Many thanks for your request in our Technical Forum. The property of stain resistance and elongation come in the first instance from the resin and cannot be greatly influenced by the addition of additives. For the matting effect in your water-based acrylic system, we suggest the following additives: CERAFLOUR® 920, AQUAMAT® 270 either alone or in combination with AQUAMAT® 208. A further very important factor is the influence in particle size. The greater the package density of your matting agents, the better your stain resistance will be. We therefore always combine different particle sizes in these formulations. For adhesion to masonary surface, we propose using our BYK®-4500. Technical Service Support

To avoid cratering during application, please use a silicone-based additive such as BYK®-333 alone or in combination with an acrylic-based additive such as BYK®-358 N.
Technical Service Support

Try using DISPERBYK®-185 instead of DISPERBYK®-182. Use this additive in combination with DISPERBYK®-102. Reduce the pigment content in the formulation. In the let-down of the base paint, put in a wetting agent such as DISPERBYK®-187 with a dosage of 0.2-0.4 on total formulation. Do not use a mineral oil-based defoamer in the base paint because it can be the reason for bad colorant acceptance.
Technical Service Support

To improve the stain resistance with our additives, you can try a wax emulsion or a combination of a wax emulsion with a silicone-based additive. Try with 2% of AQUACER® 539, AQUACER® 513, AQUACER® 498 and make a combination of these waxes with 0.02 BYK®-333.
Technical Service Support

If you are using BYK®-337 in an air-drying alkyd and recoat with the same paint, normally you will not have problems with intercoat adhesion and recoatability. If you recoat with a paint without BYK®-337, it can happen that you get poor wetting of the first coat. Poor adhesion and longer drying time can be due to the oil you have on the substrate. During the application it can be partly mixed in your paint. BYK®-337 is a good choice for your application. If you like to use less active ones with regard to surface tension reduction, you can try using BYK®-335 and BYK®-320. For thermoplastic acrylics, several additives are possible. As wetting and dispersing additives you can try DISPERBYK®-163, DISPERBYK®-110, ANTI-TERRA®-U, BYK®-P 104, ANTI-TERRA®-204, depending on the pigmentation you have. As defoamers you can try BYK®-088, BYK®-055, BYK®-066 N. For leveling: BYK®-337, BYK®-315, BYK®-331, BYK®-310.
Technical Service Support

To make an extender slurry I would disperse with dissolver 20 min. or longer until I reach the fineness I need for the application. We do not know the sigma mixer. Disperse only in water with a dispersing additive such as BYK®-154 or BYK®-151 and the thickener and put in the resin after dispersing. A cellulose-based thickener is the cheapest one. In our product line you can test BYK®-425. I do not know whether the dosage of the Bermocoll is right because we do not have expierence with such types of additives. The reason for your problems could be poor dispersing, not using dispersing additive and/or too low a dosage of Bermocoll, or that this is not the right additive for this application at all.
Technical Service Support

To produce emulsion paint: Put water in a container, mix in a defoamer such as BYK®-023, put in a dispersing additive such as BYK®-154. Under stirring with dissolver, put in TiO2 and extenders. Disperse for 20 min. at high speed. Check if the fineness is good for your application. Complete the paint with the emulsion, thickener, preservative, co-solvent, defoamer. If BYK®-346 is not good enough for substrate wetting, it could be that you have not used the right dosage, or the co-solvent content is too low. Then change to BYK®-348. An alternative option is to use BYK®-DYNWET 800 instead. A combination with a silicone-based additive such as BYK®-333 can also help.
Technical Service Support

As a wetting and dispersing additive, we recommend BYK®-154. For good defoaming, BYK®-012 added to the grinding, and BYK®-028 added to the let-down should be used. A leveling additive such as BYK®-345 is not helpful because of foam stabilization. With BYKETOL®-WS, the leveling can be improved in many systems.
Technical Service Support

Our best defoamers for solvent-borne alkyd paints are BYK®-066 N, BYK®-052 and BYK®-065. Start your trials with a dosage of 0.3-0.5% on total formulation. Also the use of the right wetting and dispersing additive helps in reducing foam formation. Try DISPERBYK®-107 and use as little rheological modifier as possible.
Technical Service Support

The following wetting and dispersing additives and dosages are recommended in order to improve the color acceptance for acrylic emulsion paints. Dosage: % delivery form on total white paint - DISPERBYK®-187 (0.5-2.0) -BYK®-151 (1.0-3.0) - BYK®-154 (1.0-3.0) - DISPERBYK®-192 (1.0-3.0) - DISPERBYK®-102 (0.5-2.0) (in our experience, pre-diluted and incorporation with higher speed) - DISPERBYK®-2095 (1.0-3.0) - DISPERBYK®-2096 (1.0-3.0). Please control the drying property in each case and test all additives, independent of PVC.
Technical Service Support

We have only lab expierence in improving colorant acceptance of white alkyd bases. One possibility is to use DISPERBYK®-108 in the grinding, the other is to use DISPERBYK®-109 as post-addition additive. To improve colorant acceptance in a clear, please try DISPERBYK®-108, ANTI-TERRA®-U, DISPERBYK®-187, DISPERBYK®-102, DISPERBYK®-109, BYK®-220 S 0.5-1.5% on total formulation. Or is it possible to put extra additive in the black colorant? Then try DISPERBYK®-102. It is also important that there are not any great differences in viscosity of paint and colorant. You will also achieve an improvement if you put in the colorant first and add the alkyd slowly under stirring. The worst result will be obtained if you have a low viscosity alkyd and a high-pigmented high-viscosity colorant and put the colorant on top of the alkyd base and start stirring after 5 minutes. Try to optimize the conditions.
Technical Service Support

Propylene carbonat is used as a polar activator for bentonites. In our opinion, you obtain a better gel and better performance in the paint when using a wetting and dispersing additive such as ANTI-TERRA®-204, ANTI-TERRA®-U, BYK®-P 104 or others instead of propylene carbonate. Bentonites are in powder form, and only a few have a special treatment so that they can be incorporated directly in the paint. With the others a gel has to be formulated before usage to avoid seeding and uncontrolled viscosity increase during storage.
Technical Service Support

Additives of ours which are used to make a bentonite gel are ANTI-TERRA®-U or ANTI-TERRA®-204, and others. The gel has the following formulation: solvent 85 g, bentonite 10 g, additive 5 g. Put the solvent in a container, stir with a dissolver, put in bentonite under stirring, disperse it for 10 min. at high shear. Put in the additive under stirring and disperse for 2-5 min. Apply on glass to check if you have a proper gel without seeding. If our additives are completely burned at 800°C, I cannot say why because we have not made thermograpic analyses up to such temperatures.
Technical Service Support

As defoamer for medium alkyd you should test our BYK®-066 N and BYK®-052.
Technical Service Support

For dispersing pigments in long oil alkyd you can try DISPERBYK®-108, DISPERBYK®-115, DISPERBYK®-116, DISPERBYK®-174, DISPERBYK®-164 and DISPERBYK®-182. I recommend you first do a compatability test in your alkyd resin and in a clear coat formulated by your resin. Put 5% of the additive in each and check which one gives a clear solution without seeding. Use these ones in dispersing your pigments.
Technical Service Support