What is the best caulk to use on an inside door to fill nail holes?
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Indoor door and window caulk. It will say it right on the tube. Anything you get at your local home improvement warehouse will be good quality.
If you have a wooden door, you should use wood putty and not caulk.
If it is nail holes on the door frame or trim you want to use a non shrink spackle.
If it is caulking around the door frame or trim where it joins the wall then you want an acrylic caulk made for doors and windows.
This sounds facetious but is true, the cheapest. This is simply not a demanding use.
For bathrooms and kitchens around fixtures, showers and floors, 100% silicon is best if you don't need to paint it. Otherwise buy the siliconized acrylic, about $7 per tube, outside, same thing as kitchen and bath but products made for outside.
If it is a wood door, you don`t use caulk, you use wood filler. It can be sanded and painted, and, depending on the product, mixed with oil-based stain.
To fill nail holes I recommend using wood putty. Caulk will tend to shrink with age and open up cracks around the circumference of the hole.
Also, if you are finishing the wood with a varnish or clear stain, you can closely match the color of the natural wood and get better looking results.
Since it is inside, I would shy away from the silicone's and stay with a water based chalk. The difference being the ease of clean-up. Also check out shades of chalk, you may be able to get a close match. With all that said, I would personally use a wood filler rather than chalk. It best covers the above options, and is easily sandable if necessary.
USE RED DEVIL " ONE TIME" LIGHTWEIGHT SPACKLE
NON SHRINKING - NO SANDING - PAINTABLE PRACTICALLY IMMEDIATELY
I would recommend using fast and final spackling. Goes on easy and ready to sand in just minutes, also much easier to paint over. However what ever you use will need to be primed over. Paint will not stick to caulk and any thing else will show through.
DAP has a nice spackle. It is red when you put it on and dries to white so you will know when you can sand it down.
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