A. It really depends on the type of weed killer that you will be using. If you are applying products such as Roundup ProActive that contain glyphosate then it will kill the grass. There are products called selective weed killers that will control weeds present in the grass but will leave the grass itself unharmed.
A. We recommend keeping children and animals off the lawn after applying weed killer until it has dried and started taking effect. some herbicides will take longer to dry than others, and this can largely depend on drying conditions. To ensure safety, it's best to wait until the lawn is completely dry before allowing them back on it.
A. Depending on the type of weed killer you intend to use you may require suitable training to purchase and use the product. Professional use & total weed killers are required to be used in line with the Approved Code of Practice set out by The Food & Environment Protection Act 1985 (FEPA) & Control of Pesticide Regulations 1986 (COPR). When placing an order for a professional use pesticide you must confirm that you have read, understood and will comply with the regulations.