Tips for 4100 Clear Vapor Blocking Epoxy

Using As a Primer For Cementitous Overlays:
4100 is a great primer for overlays, it wicks into the concrete, even old oily concrete and it provides a vapor block which will reduce the chances of the overlay from bubbling up from the surface due to MVE. Most decorative overlay contractors have at least one job they know of where their overlay always bubbles up and they have to go back and repair it each year. 4100 prevents allot of this from happening in the first place if installed correctly. First be sure you are coating over clean porous concrete, if you suspect more than 10lbs of MVE then mild shotblasting or grinding should be done to get an ICRI of at least 3. When removing the loose sand the next day it is EXTREMELY IMPORTANT that the surface look like sandpaper. If not you will have glassy shiny areas and the Cementitous materials will not bond well to these areas. If you have shiny spots apply a fast setting epoxy like our 4910 or 5205 hybrid primer to the area and then re-apply the sand. Wait 20 minutes or so and remove the sand, now you are ready to apply the topping.
Using As a Primer For Other Products:
If allowed to dry for 24 hours or more and the 4100 is very hard then lightly sand the 4100 (use a floor buffer with 160 screens) before applying other 2 component topcoats.
Coating Floors Over 10bs of MVE:
We recommend shotblasting or other mechanical profile be done on concrete surfaces that have an MVE Reading of between 10 and 20lbs.DO NOT USE ON FLOORS WITH HIGHER THAN 20LBS MVE!
Coating Over Tight Hard Troweled Concrete
Thin the 4100 with xylene (use acetone in strict AQMD districts) up to 40% and apply at the same coverage rates.
Coating Over Oil Stained Concrete
Clean of as much of the oil contaminants as possible and allow to dry. Some applicators will burn off heavily stained areas using a small propane torch. Thin the 4100 with xylene (use acetone in strict AQMD districts) up to 40% and apply at the same coverage rates. Apply 4100 to the concrete in stained area as a test and allow to dry. When dry check the 4100 to evaluate its penetration and adhesion to the concrete and if satisfied proceed to seal the entire area in the same manner.
Accelerating:
Use 41 accelerator to increase the set time in cold environments. at 50 degrees 1 accelerator will cause the material to dry as if it were 70 degrees, use 2 accelerators at 40 degrees. Do not use accelerators to shorten the set time so the job can be done faster because this can decrease the adhesion and MVE protection.