How to Seal Exterior Spackle How to Seal Exterior Spackle

What You'll Need
Spackle
Paintbrush
A sander or sand paper
Appropriate primer
A spackling knife

Spackle, or spackling paste, is a type of filler available in many forms. Interior surfaces often require lightweight spackle, while outdoor spackle is more heavy. This is because the outside is exposed to direct sunlight, greater temperature and humidity extremes, rain, and snow. Thus, outdoor spackle has to be more flexible and able to resist the weather. Remember to always keep the lid of your spackle can on whenever it is not being used.

Step  1 - Choose the Right Spackle

Newer spackling materials are lighter in weight. You can still buy oil or latex spackle, but they are heavier and are not used much anymore. Heavier spackle will give you a more irregular finish. Spackle is not re-wetable after if dries. It does not  dissolve in water. The newer spackling materials are shrink free. Thus, they can be used to fill small areas. Also, sanding is kept to a minimum. Spackle dries very quickly, sands very well, and can be coated with latex or oil paint once dry. The key to getting a seamless wall when done is to sand it and apply primer properly.

Step 2 - Sand Down the Area

The area that you intend to spackle must be sanded down before primer is applied. Do this with sanding paper or a sander. Makes sure that the surface is completely clean of sanding dust before continuing. Remember that spackle is not intended to be used to float drywall joints or for holes that are too deep.

Step 3 - Apply a Primer

You must prime bare wood before you spackle. It is a common mistake not to do so. If you do not prime it, the surface will be irregular. Also, there will be dull spots and any paint that is applied will not be blended correctly. There might also even be shiny spots in the finished paint. It is also important to use the right kind of primer. Bare wood and rusted metal use different kinds of primers. If there are knotholes in the wood, prime them with material that can seal in the sap. Bare wood might take out moisture from the patch. If this happens, the surface might dry out and cracks might form around it. So, first prime the wood, let it dry, and then finally you can apply the spackle. Do not use stain blocking, or “stain-kill”, primers because this will cause “shiners” to a appear on the wall. These are spots where the paint is too glossy. The best type of primer to use is the finish paint itself. There is also a kind of primer called PVA, or polyvinyl acetate, which is a new drywall kind of primer.

Step 4 - Apply Paint if Applicable

To seal exterior spackle, apply one coat of the finish paint. Then wait two hours for it to dry. Then apply another coat.

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