Thank you for the suggestions, unfortunately I can't find it as a food additive and the boat repair shops use other fillers. I found "West System 406 Colloidal Silica" in some UK shops, I read somewhere it's hydrophilic, so I'll just try to find a shop that ships to me. Again, thank you for the help.
I am trying to buy hydrophilic fumed silica but can't find any suppliers, nobody in my country sells it, tried ebay and wasted a month waiting for a package they never sent. Any Europeans know of an online store I can buy some?