Emergency puncture repair. No tools or jack needed. No damage to tyre. Safe non-toxic formula. Washes out of tyres after use. Holts Tyreweld Puncture Repair 400ml. Holts Tyreweld - Medium - Emergency Puncture Repair - 400ml aerosol. Repairs and reinflates tyres quickly and easily. The non-toxic formula does not damage tyres and washes out easily after use. Suitable for small/medium tyres up to 16".