I'm getting an all-in-one system and I'm planning to build some media baskets out of acrylic sheets and egg crate mesh to put in the rear chambers. I have some Weld-on #16 that I plan to use but I notice a majority of people use Weld-on #4 instead. Are there disadvantages of Weld-on #16 vs #4? Is #16 aquarium safe after it sets? Also will #16 bond the egg crate mesh to the acrylic? Thanks!