nopcosperse 44 20 parts available from henkel ts 100 silica 63 parts available from degussa and water 110 parts are pre mixed with a high speed mixer and added to the aforementioned eps 4230 and amp 95 mixture dowanol dpnb 15 parts available from dow and water 15 parts are pre mixed and added to the above to this is then added kathon lx 1 5 pct preservative 1 part available from rohm amp haas and polyphase af 1 anti microbial agent 3 parts available from troy chemical the total mixture is then mixed at high speed for ten minutes and held at a temperature of about 27 u00b0 c a grind test may be run if desired typically the formulation at this stage will have about a 6 hegman value to the above is added 20 parts water and byk 025 defoamer 1 2 parts available from byk an alternative preferred formula for a suitable topcoat of the present invention formula b is made according to the following procedure in a high speed dispersion tank is charged 189 5 parts water to this is added under agitation tamol 731 surfactant 20 parts available from rohm amp haas amp 95 2 parts 2 amino 2 methyl 1 propanol available from angus chemical dowanol dpnb co solvent 23 parts available from dow chemical byk 025defoamer 1 2 parts available from byk kathon.