TDS

PL® Roof and Flashing
Polyurethane Sealant
Page 3 of 5
Revision: 08/25/2021
Supersedes: 06/22/2016
Ref. #:440388
Technical Data Sheet
DIRECTIONS
Tools Typically Required:
Utility knife, caulking gun, and tool to puncture cartridge seal.
Safety Precautions:
Wear gloves to avoid skin contact. Sealant may temporarily stain skin.
General Preparation:
For best performance and results use above 40°F (4C). In cool or cold weather, store container where temperature is about
75°F (25°C) for at least 24 hours before using. Cut nozzle at a 45 angle to desired bead size and puncture inner seal. Protect
open containers from heat and /or direct sunlight.
It is the user’s responsibility to check the adhesion of the cured sealant on a test joint before applying to the entire project.
Surface Preparation:
Surfaces must be structurally sound, dry, and free of all loose aggregate, paint, oil, grease, asphalt, release agents, wax, and
mastic compounds prior to the application of the sealant.
Masonry:
Concrete, stone, stucco, and other masonry must be cleaned where necessary by grinding or wire brushing to expose a sound
surface free of contamination. If joint surfaces have absorbed oils, sufficient concrete must be removed to ensure a clean
surface. Concrete must be fully cured.
Wood and painted wood:
Cut back weathered and treated surfaces and dry rot until clean, sound wood is reached. PL S30 will adhere to most new and
old dry, oil-free wood. Scrape away paint to bare wood.
Metal:
Scale, rust, and coatings must be removed to expose bright metal. Protective coatings should be removed with a solvent as
well as any chemical residue or film.
Joint Preparation:
The number of joints and the joint width should be designed for a maximum of ± 35% joint movement from the initial joint width.
The depth of the sealant joint should be ½ the width of the joint. The maximum depth is ½” (13 mm) and the minimum is ¼ inch
(6mm). The maximum recommended joint width is 1.5 inches (38 mm).
Recommended Joint Width to Sealant Depth Ratio:
Joint Width
(inches)
Sealant Depth @
Midpoint (inches)
Joint Width
(mm)
Sealant Depth @
Midpoint (mm)
1/4 - 1/2
1/4
6 – 13
6
1/2 - 3/4
1/4 - 3/8
13 - 19
6 - 10
3/4 - 1
3/8 – 1/2
19 - 25
10 - 13
1 – 1.5
1/2
25 - 38
13
In deep joints, the sealant depth must be controlled by Closed-Cell Backer Rod or Expansion Joint Filler. Other caulks should
not be used as fillers. Do not prime Backer Rod or Expansion Joint filler. Do not puncture Backer rod as it may cause bubbling.
Where the joint depth does not permit the use of backer-rod, a bond breaker (polyethylene strip) must be used to prevent three-
sided adhesion. Cork or rigid non-impregnated cane-fiber joint fillers are suitable. Make sure the backing material is tight to the
sides of the joint to prevent loss of sealant through the bottom. Note: Do not use other caulks or sand as a bottom bed in a
joint.
For best results, caulking and sealing should be performed when temperatures are above 40°F (4°C) and below 90°F (32°C).
Application to moist surfaces will adversely affect adhesion.
Priming:
Priming is not required for most applications however, joints subject to periodic water immersion must be primed. Substrates
such as copper, stainless and galvanized steel, or Kynar coatings typically require the use of a primer. Loctite does not provide
primers however, possible primers are MasterSeal P 173 or MasterSeal P 176 and are available through industrial outlets only.
Apply an appropriate primer full strength with a brush or clean cloth following instructions. A light, uniform coating is sufficient
for most surfaces. Porous surfaces may require more primer, but do not over apply. Allow primer to dry prior to sealant
application. Priming and sealing must be done on the same working day.