The best way to prevent bleeding is with a water tight seal.
Caulking stained wood siding.
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There are two main places it never should be installed wood or any painted surface.
Bottom of siding boards should not be caulked water is meant to exit through the bottom of each board.
Caulking them is a mistake and the caulking is likely to fail prematurely.
Placing caulk over large portions of wood siding prohibits the natural movement of the wooden panels and can cause extensive damage to the exterior of your home.
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The best option in the case of stained wood molding is to stain the caulk to match the wood.
Therefore if your siding is very old and extremely discoloured your best bet might be to work with paint.
Siding is often textured and if you slide the tip of the tube along the bumpy texture the bead of caulk will.
If your molding is painted white caulking with white caulk is all that s necessary for a perfect finish.
Siding caulk.
Many professionals like those at james hardie also agree that you should not use caulk on fiber cement siding unless there is no metal flashing underneath.
Stain generally comes in a variety of different pigment concentrations thus some will cover more than others.
Do ride the smooth edge when caulking a seam between a window and textured siding.
Step 1 select a stainable caulk.
If paint will ever be applied to an area then silicone does not belong there ever in any way.
Possible side effects of sealing cedar siding.
Cedar naturally releases chemical extracts when it gets wet.
The main side effect of a botched cedar sealing job is chemical bleeding.
These chemicals darken as the wood dries leaving streaks that can show up through a layer of stain or paint.
If your molding is stained white caulking would cheapen the finish and diminish the value of the work.
Silicone caulk is excellent at water sealing and flexibility so it has its place in construction.
On the other hand stain or dye will penetrate most materials including wood brick and sometimes even vinyl.