You can caulk over the cracked caulk if the crack is not exposed much.
Stick on caulk.
Silicone caulk in particular works well when you re sealing nonporous surfaces such as ceramic tile and metal from water.
If oil is still lingering on the old caulk new caulk won t stick apply a wider bead of new caulk with a caulking gun making sure it adheres to the surfaces on either side of the original caulk.
At the first instance the new caulk will stick to the moldy caulk but after drying out newly applied portion will come out of the surface quite easily.
Test a small area with the wider bead of caulk to ensure it sticks well.
Make sure that the product you get is labeled as paintable because paint will not adhere properly to certain types of caulk it will bead up like oil trying to mix with water.
And the second answer is yes.
This is a nuisance if you want to do something like repaint a wall where silicone has been used to fill gaps between the wall and trim for example.
Use this caulk for filling small gaps and blemishes in wood trim and for sealing joints between wood parts that will be painted.
Get it as soon as wed sep 23.
Caulk does not stick to caulk.
Generally the same caulk can be used for all of these applications.
It is essential to assess what type of caulk you ve used and are planning to use because silicone caulk can be tricky to remove and reapply.
Your best bet is to remove the old caulk from the area entirely and reapply with the new caulk.
Caulk for use around doors windows and molding will be clearly marked.
One downside of using silicone caulk is that you normally can t paint over it paint simply won t stick to it.
Apply instatrim to window and door trim instead of weather stripping to keep your energy bills low use it instead of wood edging to cover uneven gaps around baseboards floors and wall cabinets or apply this peel and stick caulk on the base of a toilet to keep your bathroom sanitary and easy to keep clean.
Silicone caulk is tricky to paint over because the paint just beads up and doesn t stick to the surface well to cover it up.