Are they bulding it and sealing it all in one day and have you had to tell them the location of the tank in relation to any walls or anything?
I thought the people who will be doing mine would seal the inside then come the day after and scrape off any excess from the outside and then seal the outside,let us know how they do it buddy and dont forget the pics and how long thedy recommend you leave it to set.
i told them they only have access to 3 corners they said the corner they don't have access to would just look messy from the outside which doesn't bother me
they said they use a compressor to pump the sealer in