User Guide

Technical Bulletin
Polyurethane Protective Tape
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Typical Physical
Properties and
Performance
Characteristics
For typical physical and performance refer to technical data pages for 3M™
characteristics of Polyurethane Protective Tape:
SJ8641 8641
SJ8681 8681
SJ8667 8667
SJ8672 8672
SJ8663 8663
SJ8545 8545
Environmental Health
and Safety
Before handling any chemical products, always read the container label and the MSDS.
Local air quality regulations may regulate or prohibit the use of surface preparation and
cleaning materials based on solvent (VOC) content.
Suggested Surface
Preparation Procedures
Although this procedure refers to a “radome” structure, the procedure is valid for other
types of structures such as wing tips, drop tanks, navigational light lens, etc.
The radome must be in good condition before a boot is applied. Freshly painted radomes,
should be allowed to cure or dry for 48 hours at 72°F (22°C). Paint cure can be accelerated
by baking the radome at 150°F (66°C) for 8 hours. The surface must be smooth without
dirt or paint “nibs”. If defects are present in the paint, lightly sand the paint with 400 grit
sandpaper. If there is a multicolor paint scheme on the radome insure that there are no
paint edges to interfere with the adhesion of the boot in these areas. Paint lines can be
minimized by the use of Scotch
®
Fine Line Tape 218 during the paint process. Paint lines
can be reduced after paint cure by light sanding with 400 grit sandpaper. Loss of gloss
during any sanding process will not be noticeable after the boot is applied.
Removal of
Existing Boot
1. Lift an edge of the boot by slowly, carefully peeling back the boot at 180° (back against
itself).
2. To make the removal easier, soften the adhesive by using a wallpaper steamer (warm
boot to 120°F [49°C]) or using hot water and a sponge.