Nothing soakes up paint more than cement....thats exactly what u want is good penetration of the sealant but i know its not cheap. Lookin good and dont get discouraged, it def wont leak with the cement board and fiberglass soaking up all the epoxy. Any build ive ever done always ended up costing more $$$ in the end but itell b worth it. Atleast u know ur doing it right and not putting down a few mm of sealer. I wouldnt mix brands of epoxy u never know how they may react to each other.
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