Main water tank
Done!
Before...
I Opened the tank and found osmosis pox covered whole internal surface. I do not concern about structural strength, but more see problem in chemicals may get in the fresh in the water, and surface strength to be able to keep 2 part coat layer.
All frame looks like somebody just screw lid without thinking that any hole in the frame is potential leak later. I feel there was 3 different attempts to mount lid.
And sure, water tank lid made from plywood (exterior plywood to be clear) will not keep water virgin clear.
And "cherry" on a top: DRILLED!!! 6mm hole in a middle of the tank bottom. More questions than ideas... Who? Why? What purpose?
What was done.
All "pox", holes in frame and hole in the tank bottom are sanded filled and overglassed. Also I added tape on bottom side edges.
Internal surface covered with two layers of special drinking water epoxy liner LiquaTile 1172. It is only product intended to work with drinking water and certified for this and what i was able to source in reasonable quantity (3 quarts). These 3 quarts was exactly what I needed to make 2 layer liner.
This product is designed to work on concrete and steel bases, however manufacturer confirmrd it will work well on FRP as well.
It is really hard to work, it is very dense and it is not recommended to use with any kind of thinners.
After setting it makes nice glossy surface, if not count some runs where I put too thick layer, but it is not cosmetic surface, so, who cares.
Only compromise in materials - a used butyl tape as sealant on the lid. not sure good it or bad and how much i expect water contamination.
Idea is to fill full (completely full) tank with known good drinking water from city system,
Take water sample during feeling and put it in the freezer.
Wait 2-3 weeks and take sample from the water stored on the tanks.
Then send both samples to the lab and make sure the water is not critically contaminated.
Interior
I have made templates for nav station.
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