We have a bathtub with a tile surround. I recently pulled the old
chaulking between the tile backing and the lip of the tub. I reapplied
new clear silicone chaulking. The problem is, I think water is getting
behind the chaulking somehow. Instead of white grout being seen behind
the clear chaulking, I see orangy/brown grout (its getting discolored).
What's the best way to apply new chaulking so that water will NOT get
behind it. I used a chaulking gun to create a bead a little wider than
the width of the grout affected. Thanks!!
You may have not prepped the surface well enough for the sealer to adhere,
and the silicone has pulled away a tiny amount, sucking shower water in by
capillary action, and forming orangy algae in the crevice, where it never
dries out. At this point, it is best to take off the silicone with a razor
blade. Use a sharp utility knife to cut a V along the caulk bead, then use
individual shaving style razor blades (hardware store) to scrape off the
last of the gook. Then scrub with a brush and 409 or Fantastic, rinse, dry,
and do a final hard wipe down with a rag soaked in a solvent such as
denatured alcohol, to get all residues and dirt off. Use a hair dryer to
thoroughly dry the area. Then use a fresh cartridge of Bathroom GE silicone
sealant - it is white, not clear, and made for this application, with
algicides in it. Cut nozzle near end, at a slight angle, and pressure it on
as you glide the nozzle in direct contact with the wall, so that the crack
is under pressure and the bead oozes out a tiny bit at the sides. Let dry
at least overnight. Once set, razor blade excess off in a manner that does
not damage the main bond area.
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