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To prepare for exterior painting, one contractor says they will use the method of "abrasion and burnish", instead of "scrape and sand" to remove the loose paints. It sounds good but I have never heard of it before. Asked a few handy friends, no one seems knowing. I'm wondering if anyone here may have had used it before? Would appreciate any comments. Thanks.
Just ask them what they mean... for instance, sandpaper is just a method for abrading a surface and normally when you burnish something, you brush or polish it (so maybe they use a wire brush).
In any case, just ask them specifically what they do, the tools used, the complete process. It'll mean something different to everyone.
I would certainly find out in detail how they are going to prep the job. Burnishing is an act of rubbing the surface until it shines. Obviously the guy doesn't have a strong command of the english language. MY guess is he's going to wire brush the surface and what comes off is what you're going to get. If you have flaking paint and ESPECIALLY if the wood under it is a grey color, you MUST use an oil based primer on the entire house or side where it has turned loose. Failure to do this will have the paint turning loose again in a very short time. If you could look at the grey colored surface under a microscope, you'd be looking at something that appears to be hair. It's the cell structure of the wood which has ruptured. A water based paint will only coat a surface, there is zero penetration. The paint will stick to the hairy looking stuff and the first major temperate change will have the hair breaking off and the paint comes with it. You prime the entire side as some of the dead paint is not going to come off with scraping or wire brushing. The oil based primer will penetrate the oil paint and the edges of it and bind it to the house. While there are some decent water based primers, they will not work in this particular application, you'll need oil IF there is grey colored wood.
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