Astrata Clean n Seal 
Concrete Restorations 
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Please be advised Astrata Clean n Seal take no responsibility for any person who may slip or fall upon the surface once restored. Applying a sealer will make the surface more "slippery" when wet. It is advisable to not seal surfaces that are too steep, especially if the surface is a smooth texture.
There are "anti-slip" products available, however common sense says the traction of vehicle tyres will pull the "anti-slip" material off eventually. It is sometimes better to not seal these driveways.
Occasionally there are driveway surfaces we refuse to even quote due to being too steep/smooth to seal.
Having said that, it is possible to slip on wet grass! Each driveway surface is different and each owner must weigh up the risks/benefits of applying sealer and accept the responsibility if an accident occurs.
We have sealed over 1500 driveways and have very rarely had a client report anyone slipping on a restored surface. One reason why is our prudent discussions with owners prior to commencing/quoting work.
Besides "slipping" - there are other risks in resealing concrete.
Some obvious factors that effect a sealed surfaces life are - pressure cleaning (always only clean via low pressure hose/broom), sun exposure, slope, porosity, vehicle traffic (trucks can cause significant damage), power steering needs to name a few.
If the surface is "spray-on-paving" - the risk of non-adhesion or milky concrete increases compared to wet stencil. 
If the surface is "smooth" - the risk of non-adhesion or milky concrete increases compared to "porous" wet stencil. All "stamped" concrete is classified by us as smooth as the sealer has less area to cling to compared to a porous stencil surface.
If the surface is already "milky" prior to cleaning/sealing - there is a risk of it returning later. Milky concrete can be a result of concrete having been sealed when the concrete is too wet. If the "milky" sealer is sufficiently broken down over time - in some cases it is possible to pressure clean MOST of the residual failed sealer off and re-seal with heavy acetone/xylene/MEK solvent combinations in the first coat. Each driveway is very different and the risks/rewards must be weighed up by the customer.
If the surface is being re-coloured - the above applies. 
The ideal surface to re-seal or re-colour is one that is reasonably flat, very "rough/porous", has very little residual sealer, no "milkiness" and minimal power steering needs. However, in reality most surfaces don't fit this "ideal", so we do the best we can to minimise risk. 
In summery, Astrata Clean n Seal can only reseal or recolour the existing surface texture and minimise risk. Usually there is residual sealer from a previous reseal and we cannot in most cases know what acrylic resin was used in the previous reseal. Potentially this could cause adhesion problems. We make extensive use of solvents - xylene, MEK and acetone to "soften" old sealers to give the new sealer the best chance of bonding with the old sealer.  
In general, the lighter the colour, the more porous the surface - the lower the "risks" and the longer the longevity of the surface. We always ensure the surface is at least 30 hrs dry, hence moisture is eliminated as a risk. 
Resealing/recolouring concrete is not always straight forward - each surface has risks. The information/risks above must be taken into account by the customer before resealing or recolouring. Strata Clean n Seal take no responsibility for any person who may slip or fall upon the surface once restored, or for any failed sealer issues that could arise once the work is complete. 
Having said the above -  we have 21 years experience cleaning/sealing concrete with very very few sealer issues. A reason why is we always convey to the customer the potential risks from the outset. Combined with our vast sealing/solvent experience and absolute meticulous attention to detail - we believe we are the best in the business.