Preparing to paint over varnish or old stained wood

I recently did a job that had new fire doors installed and because of this new door stops also had to be fitted, when the stops were fitted the paint came away with the old door stops. The paint had been applied over stained and varnished wood. You may have this in your home if it’s old enough, does the paint chip easily and reveal dark wood underneath? More than likely you have varnish or stained wood and painted over without the proper preparation. As you can see by the following picture it looked a bit of a mess.

The paint hadn’t adhered to the varnish underneath and simply flacked off, as you can see by the following quick video it wasn’t too much of a job to scrape the paint off due to lack of preparation when the varnish was painted over.

The following image shows the paint removed and prepared ready for the first coat of primer.

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