In one of the hotels, the key pad was rubbed and I was asked to restore it. It consists of boards covered with varnish. And this varnish in some places was stripped off and the appearance of the stand deteriorated. First of all, I clean the old varnish. Then remove all the dust with a vacuum cleaner. Next, I cover the boards with a stain in one layer. Now no door keys will spoil this substrate!
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