According to the Degussa Technical Bulletin, Aerosil 200 is "...the standard grade..." for epoxies for marine coatings and "...exhibits the easiest dispersion characteristics...". To meet higher demands for thickening, the 300 or the 380 grade should be used. Try putting together some test pieces and see how they hold up. Dennis

> A friend gave me (five) one gallon cans of "air-o-sil" has
> anyone heard of used this product? I made a test batch and it seems more
> fluffy than microballons but the strenght seems to be the same, The color
> is very white compared to other fillers, I would like some advice on this
> before i build a craft with it.

> Thanks in advance!-Johnnie