Just a point about sealing around baths.
One problem is that an empty bath will 'sit' higher than a full one with you in it. Obvious, I know, but that shift will tend to pull any seal apart. This only occurs with plastic baths, and not with cast iron ones.
Solution - Fill the bath, say, 1/2 - 2/3 full. Then perform your seal. Something flexible is likely to be best.
Only let the water out when you think the seal is set, plus a day!
Slewthy
August 2004