fiberglass tape for plywood seams

[the_deeb]

I'm trying to decide if I should add fiberglass tape to the inside corners of a plywood tank for extra support. I'm going to seal the tank with Pond Armor. My understanding is that fiberglass tape isn't flexible enough to turn a sharp corner. For those of you who've used it, how do you build up a curved/radiused corner that the tape can bridge without bubbles appearing underneath? Wood putty?

The vertical joints in my tank are going to look like the pic below. The horizontal joints at the bottom are similar, but are butt joints instead of miters and will have a 1.5" X 0.75" brace instead of a 0.75" X 0.75"

 

[Twigg]

Glass tape should be able to be pushed pretty tightly into corners, but if you are worried about it, just fix some quarter round trim in first, then glass over it.

 

[the_deeb]

Good idea, but I think cove molding might work better than quarter round.

 

[KAWAMIKIE]

I've read where guys used bondo to fillet the corners and glassed them over.

The problem with bending the glass it has the tendency to bubble up/get air pockets in it.
You seem to be on the rite track with the moulding in the corners.

 

[the_deeb]

I like the bondo idea. Will the Pond Armor adhere to the bondo? What about wood putty?