It is important to note that when you are preparing older previously painted wooden or metal surfaces, to always wear a good quality dust mask.
Some pre- 1960’s paints used Lead in their production; Lead Tester Kits are available from all leading DIY outlets and I would recommend their use if you are in any doubt about the age and composition of your existing paint, as Lead participles can be atomised through the surface preparation process and if breathed in, can be harmful to your health.
For UK Government guidelines on lead paints please follow the link below: