Can I use this on convertible soft-tops?
Yes, it is made for soft surfaces inside and outside the car and has been designed to be applied to canvas/fabric roofs although you should always check the car manufacturer's guidelines and warranty conditions first. Also, only apply the product to a clean hood in good condition and if in any doubt, test on a small and inconspicuous area of the hood first.
Is the brush safe for delicate upholstery?
Brushes are always more aggressive then soft, colour-fast cloths but they clean much better due to a scrubbing action; if in doubt, use light pressure to start with and always test on a small hidden area first.
How long will the kit last?
Each bottle provides multiple uses, but there should be enough cleaner and sealant to maintain an interior or fabric roof for months or even years to come.