Reached out to West systems with some basic questions and here is what they had to say:
Q: Is it fish safe.
A: As long as the ratio is correct, it is well mixed, well cured, and the blush is washed off, it will be safe for the fish. Here are some tips to help:
Mix ratio is 1:1 by volume or 1.2:1 by weight (resin:hardener).
As you mix, scrape the sides and bottom of the container to ensure all resin clinging to the sides and bottom of the mixing cup get mixed in.
Allow it to cure for at least 24 hours at room temperature (72°F).
To wash the blush off, just wipe it down with a wet paper towel followed by a dry paper towel immediately after.
Fiberglass cloth can be used with this, but I would only use woven fiberglass cloth that is less than 12 ounces/square yard. "
Q: Will this product add structural strength to the plywood the way 105 would, or not so much because of how flexible it is?
A: It would add a very similar amount of strength. The plywood will still be the weakest part of this structure. It is flexible for an epoxy, but it still cures so hard that a fingernail does not indent it. If it is hit with a hard object, like a ball-peen hammer, it will indent instead of crack. It is nowhere near as flexible as a urethane or silicone sealant, but is much, much stronger.
Q: From a pricing perspective I saw $300 listed for a gallon but it looks like $300 actually covers two gallons.
A: That is for 2 mixed gallons. Compare its price per mixed gallon to the 105 System, it's a little more expensive in that quantity.
Q: What thickness and coats are recommended? I am trying to determine how much I need for approximately 90sq ft.
A: The quantity you will need is based on the weight of the fiberglass fabric you are using since it will absorb some epoxy. I'd plan on using the same amount of weight of mixed epoxy as fiberglass fabric- 1 mixed gallon weights about 10 pounds. This product is a honey-like consistency, so it can be difficult to wet out fabrics that are heavier than 12 ounces/square yard. In areas where you are not using fiberglass, I'd use 3 layers of G/flex (each applied while the previous is still sticky (like masking tape). Where you are using fiberglass, fill the weave of the fabric so you cannot see the texture of the fabric on top of the epoxy.
