This technical bulletin serves as a guide to repair damaged areas of HYDRALASTIC 836. W. R. MEADOWS always recommends installing PROTECTION COURSE or MEL-DRAIN to provide suitable protection of the HYDRALASTIC 836 membrane. However, if damage occurs, the following steps should be followed.
First, cut out damaged area of HYDRALASTIC 836 and ensure exposed substrate is structurally sound, dust-free, and free of frost, grease, oil, dirt, curing compounds, release agents, or any other surface or penetrated contaminants that will adversely affect bond. Also ensure that the remaining HYDRALASTIC 836 is fully bonded.
Next, clean a minimum 6″ (152.4 mm) area of the existing HYDRALASTIC 836 with acetone or denatured alcohol to remove any oils in this overlap area.
Then, apply a new coat of HYDRALASTIC 836 to the repair area, ensuring a minimum 6″ (152.4 mm) overlap to the existing material at the specified thickness.
If a high-build system is installed with REINFORCING FABRIC HCR, apply the first coat of HYDRALASTIC 836 and then fully embed a new piece of REINFORCING FABRIC HCR into this layer. Next, apply a second coat of HYDRALASTIC 836 to specified thickness.
Finally, apply PROTECTION COURSE or MEL-DRAIN to adequately protect the membrane.
If you have any questions about this procedure, contact your local W. R. MEADOWS office at (800) 342-5976 or visit our technical services inquiry form.