Aston Martin DB AR1 Owner's Manual page 130

Repeat step 3 with the second canister.
WARNING: Because of the large air volume contained in tyres f
vehicle, two canisters are required to provide reinflation of a defl
a safe working pressure.
Fit the 30 mph maximum speed WARNING labels to the repa
and to the steering wheel. Remove the steering wheel label
a new replacement tyre has been fitted.
Drive off immediately for 10 - 20 km (6 - 12 miles) at a maxim
of 50 km/h (30 mph) to allow the tyre weld product to spread
tyre.
Stop off the road in a safe place and visually inspect the tyre
that the leak has been completely sealed. Measure the tyr
(pressure gauge in the tool kit) and if necessary drive to t
service station and adjust to the correct pressure using an ai
Limit your speed to 50 km/h (30 mph) and have the defectiv
valve replaced as soon as possible.
Purchase approved replacement aerosols and labels from yo
Aston Martin dealer as soon as possible.