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Cement can be used, or styrofoam can be used.
Pouring cement is good, relatively firm, styrofoam will become very brittle for a long time, sometimes a piece will fall off a piece of force, the door should still be firm.
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If the gap is not very large, just fill in a little concrete.
That's basically how it's handled.
Or it can be filled with styrofoam.
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If it is less than five centimeters, foam caulk can be used. If it is larger than five centimeters, it must be filled with cement slurry.
Here are three ways to get rid of it.
1. Edible oil elimination method: first use edible oil to smear the area with self-adhesive, do not need too much, apply it, and it is best to pad a newspaper on the ground, because the oil droplets are easy to drip on the ground. After more than ten minutes, take a small bamboo clip for drying clothes, you can easily shovel off the sticker, and then dry it with a paper towel, if there is still a small amount that has not been removed, do it again, and finally wash the residual oil on the door with a towel dipped in soapy water, and the door will be as clean as new. >>>More
Don't replace the cat's eye, there will be a general security door, just buy one.
Four ways to remove foam glue:
It can be cleaned with a high concentration of thinner --- banana water, but the material should not be painted on the surface, or the color of the paint will be brushed off with it. >>>More
The sealing strip on the security door can be glued with AB glue, rubber glue, 801 super glue, QIS-3003 special strong adhesive and other glues. >>>More
If you smash it with a rubber hammer to cause shaking, it will fall clean.