Begin removal by taking off the shower surround walls to gain access to the shower pan which fits under the shower surround walls.
How to seal shower tray to tiled wall.
Prepare the silicone gun.
Use a knife or pair of scissors to cut off the tip of the cartridge above the screw thread.
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Start from the corner of the shower tray where the silicone sealant was first applied.
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In the latter the bottom edge of the fiberglass wall overlaps the top edge or lip of the shower pan.
This will give you straight bead lines.
Ensure the shower tray and walls are completely dry and free from dirt and dust.
Place the silicone sealant application tool against the shower tray surface and tiled wall and draw the it along the bead of silicone sealant while apply gentle but consistent pressure to leave a neat and consistent bead with no visible gaps.
Fig 2 in this case we see a gap of 12mm has to be spanned between the shower tray bath and the wall.
This is not true for tiled shower walls however where the pan does not fit under the tiles.
You should choose your shower or bath seal by determining the maximum gap x that has to be spanned bridged.