diy?

seal the floor trap with plasticin. buy the solution on your own and flood the floor with it.  something like pye waterpruf sealer is cheap. let it sit for a day and drain any excess solution. then let it dry on its own. total time from start to dry will take a few days. and it will smell quite strong. so make sure the door can be closed to lessen the smell spread to other area.

total cost of all the materials should be less than rm 150.

no idea about ufixx.

i used pye before personally.....still no leak after a few years.

my case is leak of unknown point. so i use a paint brush to paint thin layer on the floor and a few feet of the wall.

bathroom size about 2meter X 4meter...... use about 1 litre.

your case is quite clearly the floor with emphasis on the edge between floor and wall.....common place where technique of applying waterproof cement fails.