Rapid Application - FAQs

If I am on tank water, can I use Rapid Application on my roof?

Sure can. But you must disconnect the water supply to your tank for 3-4 weeks or have at least 36ml of rain to remove the concentrate. Wet and Forget has been used for over 35 years to treat biological growth on roofs.


Do I have to use Rapid Application all at once?

No, but good planning is essential. Work to a pattern so you know where you have started and stopped. The product is fine if left in the spray container as it does not deteriorate when it has been diluted.


How long will Rapid Application last in the container?

Rapid Application has unlimited shelf life. Always the container out of reach of children.


How long does it take Rapid Application to work?

It is totally dependent on the intensity of the contamination. If it is really light you will see results within days. Otherwise it may take approximately 2-3 months to see improvements. Your concrete may turn an orangy brown when the Rapid Application is applied. This is normal and shows you have had a good reaction. The discoloration will dissipate over a short period of time and is not permanent. The good news is that when you use it again the following season, the clean up will occur within weeks. In the very worst case scenario where contamination is extreme, it may take 6-12months.


What is the coverage area of Rapid Application?

Every 2L pack covers between 150-300 sq m depending on the porosity of the surface and the level of contamination. ie painted surfaces will use less product but porous surfaces readily absorb the product and therefore coverage could be in the range of 100-150sq m.


When is the best time to apply Rapid Application?

On a cool, dry windless day and when no rain is expected for 4-6 hours. Often the evening is best when evaporation of the product is minimal. This will ensure that the surface to be treated stays wet with Rapid Application for an extended period.


Will Rapid Application affect my pets?

Not under normal circumstances. However, keep your precious animals off the treated surface until it is dry, to ensure they don't ingest any of the product. If they accidentally walk or sit in the product - wash their feet and bottoms with fresh water as a precaution.


Will Rapid Application damage my plants?

Not unless you are directly spraying it onto the plants. If you accidentally do this, then rinse the plants down with water from the hose. Or better still, protect them with paper or plastic to avoid overspray.


Will Rapid Application remove the mould off my timber decks?

Most definitely! But if your deck is older and has never been cleaned, it may be noticeably blackened with the contamination. In this case, it would be advantageous to wait a month after the application of Rapid Application and give the area a light brush with a broom or scrubbing brush with warm water to remove it. The good news is that you should only have to do this once and then the maintenance becomes so easy. Also check out our other product, Hit The Deck, for a more instant result (although it does involve more elbow grease!)


Will Rapid Application get moss out of lawns?

You will need to use Wet and Forget as the dilution rates are different. Firstly lightly water the lawn but not enough to saturate the moss. Do this late in the day when the sun is low so that evaporation is kept to a minimum. Dilute the 5L Wet & Forget 7 parts water to 1 part Wet & Forget and spot spray the moss. You may have to give it a couple of goes until you have it under control. At worst you may get slight burning on the grass but it will recover very quickly. Rake the dead moss out. then sprinke lime over the area as this is usually a sign that your pH of the soil is not quite right.


How much Rapid Application will I need to clean my roof?

The average 3 bedroom tile roof is approx 150sq metres but because of the undulations of the tile profile the actual area is a lot bigger. Therefore an average tile/concrete roof would require 2 x 2L packs, depending on how porous the surface is and how much biological growth is present. For an average 3 bedroom tile roof with lichen you would require 3 x 2L packs depending on the total area covered with lichen. For best results, spot spray the lichen, leave for 10-15 minutes and then respray the lichen and the entire roof to ensure the plant absorbs the Rapid Application thoroughly. the first application is to dissolve the waxy surface. The 2nd spray will then penetrate the lichen. For green moss and black mould, one application is normally sufficient. Your roof will normally take between 6 & 12 months to come clean.