Doing so will give the mold opportunity to extend further and break the bonding of the older from new caulk.
Marble trim seal or caulk first.
Starting with the first question here.
Use sanded caulk any time you use sanded grout and in joints 1 8 inch or wider.
Then i used a grouting sponge to wipe off any excess.
No you shouldn t caulk over the mold.
I used this sealer and just put it in a spray bottle and sprayed three coats on the ungrouted tile.
Caulk comparison dap lexel ge sashco kwik seal loctite ge ii red devil ge supreme dow corning quantity oz 10 10 5 00 2 80 10 50 5 50 5 50 10 10 10 10 10 10 10.
Magic tub and wall peel and caulk strip create a tight seal between the bathtub and wall to keep moisture out 7 8 inch by 11 feet white 3 0 out of 5 stars 345 caulk tape self adhesive sealing caulk strip waterproof repair strip for bathtub kitchen sink basin edge shower toilet and wall mildew sealing tape 1 5inch width x 10 5feet length.
Unsanded caulk has a smooth appearance and texture.
Caulk can be either sanded or unsanded.
Because marble is a natural stone and will absorb color you need to seal them before you grout to prevent the grout from discoloring the tile.
Sanded caulk has particles in it that help it adhere to wet surfaces and expand in larger gaps without cracking.
It has a grainy texture and appearance.