i've recently bought a small fibreglass tinny that i want to convert into a koi pond in the garden.
What are your recommendations on a sealer i can paint on the inside to make sure everything is water proof and safe for the fish? I want to avoid putting in a liner if possible.
And i've used one sealer from bunnings once on a small pond made of a large stone pot but it seemed to bubble up after a while and peel off.
Thanks for your help!