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Re: Mineral deposits on glass

In a message dated 1/5/2001 00:51:43 Pacific Standard Time, 
Aquatic-Plants-Owner at actwin_com writes:

> > I've got a 55 gallon tank with a broken (missing) center brace.  I made
>  > a 
>  > > relacement out of three plys of 1/4" glass and used silicone cement to
>  > glue 
>  > > it in place.  The "footprint" on the front and back tank panels was 
>  > > 2.5"x3/4".  When I filled the tank; the bond didn't hold.  Should it 
>  > > have?  Was the bonding area large enough or could the glass not have
>  > been 
>  > > cleaned sufficiently?

Been there, done that, got the T-shirt.  Permit me to tell you a way which 
has consistently worked for me.  After you clean the glass with acid, rinse 
it thoroughly and let it completely dry overnight.  Then clean the contact 
surfaces with rubbing alcohol and a clean towel or rag.  It removes the last 
vestiges of grease and "stuff" on the glass that prevents the silicone from 
adhering.  Next, apply a thick bead of silicone cement (I use Tetra brand 
aquarium cement, because I know it's not toxic to fish) to the edges of the 
glass to be used for the center brace.  Be generous with the silicone, and 
make sure the bead covers and surrounds every possible square millimeter of 
contact surface.  Set the center brace in position, making sure there are no 
surfaces between and around the center brace ends and the inside of the 
aquarium glass where the brace will sit that are not covered with silicone 
cement.  Then, get a rubber-padded furniture clamp and gently squeeze the top 
of the aquarium from front to back, over the new glass-to-glass joints.  
Allow it to set up hard for a couple of days, and then remove the clamp.  The 
center brace should be there to stay forever.