DeFelsko PosiTest AT Guide D'utilisation page 5

Dolly Application
1.
Mix the glue per manufacturer's instructions and apply a
uniform film of glue on the base of the dolly
2. Attach the dolly to the prepared coating test area.
NOTE:
If the coated surface to be tested is overhead or vertical,
a means to hold the dolly in place during the cure time may be
required, i.e. removable tape.
3.
Gently push down on the dolly to squeeze out excess
adhesive. Do not twist or slide the dolly back and forth on
the coating as air bubbles may be generated.
4. Carefully remove excess adhesive from around the edges
of the dolly with included cotton swabs.
5. Allow to cure per the adhesive manufacturer's instructions.
The decision of when to cut around a dolly is dependent on the
standard, specification or contractual agreement to which the test
is to comply. The primary purpose for cutting through the coating
is to isolate a specific diameter test area. When the decision to cut
into the coating has been made, it is recommended to cut all the
way through to the substrate. As a minimum, it is suggested to
carefully cut away excess glue from the dolly application process.
This typically prevents a larger area of coating from being pulled
away from the substrate, resulting in a higher pull-off pressure.
Cutting Instructions
1. Cut through the coating around the edges of the dolly with
the included cutting tool, removing any excess glue.
2. Clear away any debris from the cutting process.
NOTE:
- Cutting may induce coating surface flaws such as
microcracking that may alter test results.
- For coatings with strong lateral bonding, it is recommended to
cut completely through the coating down to the substrate.
Drilling Template
When testing very thick coatings, an optional drilling template
may be preferred.
Test Area Separation
3