Its been about 10 years and still doing alright on original coat.
Power wash a torch down roof.
Clean the entire roof of any residual cleaning products and dust with a power washing machine.
All cracks and leaking areas should be repaired before the paint job.
Scrub areas where water ponds with detergent and water and rinse well.
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Allow to dry thoroughly.
Use low pressure to spray it clean.
Instead soft washing with a garden hose is least likely to chip dent or crack the tiles or panels.
Leave the roof to dry.
This is because the water comes out too forcefully and can damage the material.
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Sweep or hose down area to remove all dust dirt and residues.
Here is a link preparations instructions to get the roof ready to coat.
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The power of a pressure washer can damage the shingles on your roof so it s important that you select the proper spray tip.
It is applied almost like paint so all you would need to is power wash your existing flat roof and apply another coat.
Most contractors don t recommend pressure washing or power washing a roof.
Remove rust by wire brushing.
Start with a medium pressure spray pattern and adjust from there accordingly.
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Use similar materials to patch up the damaged areas.
Always stand on a dry area of the roof as wet shingles can be very slippery.
Pressure cleaning a roof when done properly using rotary cleaning equipment is safe cost effective and will not force water through or under tiles as the jet angle is controlled and always points away and down the roof rather than into or all over the place which is the case when blasting with a lance or wand is used.
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The coating protects the roof from elements specially the sun which degrades roofing material so that is how it extends the life of roof.