Instructions for In-Field Adhesion Test-Patch (Silicone Coating -Tropical #924/Tropical #923)

Power Wash and rinse the selected test area and allow to dry. If you are not able to power wash then clean test area with industrial detergent or similar standard roof cleaner. Use a Scotch Brite® pad to scrub the surface prior to the rinsing process. Rinse and allow to dry.

Select a representative 12” x 12” test substrate area of the roof. Then:

1. Evenly brush apply approximately ¼ cup of the silicone coating to the 12” x 12” test area. Immediately embed three(3) 1” by 12” Tropical #932 polyester fabric strips and brush-in lightly to help saturate the fabric with coating. Allow a minimum of 3 inches of fabric to overhang outside the coated section. (See Figure 1)

2. Immediately brush apply a second ¼ cup of Tropical #924 or #923 silicone coating over the saturated fabric. Brush the coating lightly to assure no air bubbles are entrapped. Make sure the cloth is completely wet thru. Leave 3” of uncoated fabric exposed. Under windy conditions, secure the uncoated fabric to the roof surface with duct tape. Allow the test areas to cure a minimum of 48 hours prior to testing for adhesion. (See Figure 2)

3. Align a straight edge ruler to the edge of the long end of the coated fabric then score lightly with a razor knife taking care not to penetrate the underlying roofing substrate. Repeat this step on the other long edge of the coated fabric. (See Figure 3)

4. Secure the pointed end of a large paper clip into the uncoated exposed fabric. (See Figure 4)5. Slowly hand pull the first inch of the coated fabric. (See Figure 4)6. Using a digital-readout portable fish scale measuring in pound force (lb-f) units hook the bent

end of the paper clip. (See Figure 5)7. Pull the coated fabric strip straight up (perpendicular- 90°) to the coated surface. Pull in a slow

and steady rate. (See Figure 6)8. Observe the fish scale readout. Estimate the average pull strength readout on the fish scale

device measured throughout the pull test. Repeat this procedure for the remaining two coated strip sections. Report an average of the three strips pulled and record. There must be a minimum of two (2) pound-force (lb-f) of “pull strength” for the coating adhesion to be considered acceptable for field performance. (See Figure 7)

9. Note: If the coating is shown to be cleanly separating from the substrate this is called“adhesive” failure. (See Figure 8). If the coating is separating within the coating itself this is called “cohesive” failure. (See Figure 9) Regardless the, 2 lb-force requirement is applicable in both modes of failure. Report average pull test value and mode of failure.

Please consult with your Tropical Roofing Products representative for any questions or concerns with regard to applicability of this test procedure.

Florida 1818 S.W. 31st Avenue Hallandale, FL 33009

Texas 1225 Brai Drive

Port Arthur, TX 77640 (800) 535-6947

California 14435 Macaw Street La Mirada, CA 90638

(877) 827-2622 (866) 727-0091v1.0 - 06-03-16

Pacific Northwest 14325 NE Airport Way

Suite 107Portland, OR 97230

844-854-9323

Required Tools

Figure 2.

Hand-pull 1”

Figure 4. Figure 5.

Figure 1.

Figure 6.

Adhesive Failure

Cohesive Failure

Figure 3.

Figure 7.

Figure 8.

Figure 9.

2 lb-f Min.