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What to choose for garage roof waterproofing?

I wanted to repair my garage roof soon (prefab garage, flat roof, 18 years old). So far it has had a clunky bitumen coating on it. There are no cracks, etc. on the roof. Should I reapply the coating properly or should I choose another method?

If painting, what primer and what size bitumen should be used? The choices are enormous.

• garage roof
• roof coating