Crafco 56900, Operating And Service Manual

Page: 24 / 38

24
APPLICATION OF THE PATCHING PRODUCT
During the time you have been preparing the patch areas you should have calculated
the amount of material needed for the repairs.
Place bags of material in the mixer and heat. Start the agitator as soon as possible to
break up the bags. The heat up time is usually within 60-90 minutes. Care should be
taken not to overheat the material. If material temperature is too high, lower the burner
material temperature control and/or open the lid.
1. Have the tools needed for the repair heating in the heated box.
2. Heat the discharge gate.
3. Remove at least two pails of product and pour back into the melter. This will
insure a good flow of material when you start the application.
4. Apply the first lift of material to the repair. Apply adequate material so you get
material within 1” of surface.
5. Allow the material to cool for a period of time allowing air bubbles to move to the
surface of the product. The bubbles are generated from uncured primer, air, or
moisture. When the bubbles stop rising to the surface (usually within 15-20
minutes). Flash surface with hand torch to “pop” bubbles.
6. Apply the next level and float surface of the material with the hot irons. Seal the
edges of the repair by pulling liquid to the edge, and then remove the duct tape.
The main portion of the material will self-level, but you may need to do some
smoothing with the hot iron to insure a level surface.
7. Allow this material to cool similar to the first lift - you may not experience as
many bubbles this time but some may appear. When they do, flash them with
the torch.
8. Dry the aggregate dressing prior to placing the material as wet or damp dressing
will not adhere. Smooth the aggregate dressing material over the patched area
with your gloved hand. This will insure coverage of the whole surface of the
material.
If you applied the aggregate dressing material too soon the bubbles will continue to
rise to the surface and pop leaving a pock marked surface. If this occurs, adjust your
timing to allow more bubbles to break the surface.
9. Shut down the Patcher I and clean up the repaired area. If the cooling time of the
material needs to be shortened, broadcast some water over the surface.
10. Sweep excess aggregate dressing material from the surface of the repair and
finish clean up.