Teak Caulking SIS 440 Application Instructions:
1. Seams must be clean and dry. Surrounding wood should have less than 12% moisture content. DO NOT ATTEMPT TO CAULK WET SEAMS. If water or moisture is present, cover area to be caulked, and allow to dry. In some cases, this may take several weeks. For this reason, it is best to caulk under cover. If cover is not available during a reseam, only open as much seam as can be cleaned and recaulked without moisture getting into the seam.
2. When caulking, the ambient temperature should be between 40-90° F. If it is too cold, caulking will not cure. In the tropics, the teak deck may become so hot from the sun that the uncured caulking will bubble out of the seams.
3. Seams should be thoroughly cleaned back to fresh wood. old caulking can be removed with a razor knife and reefing hook, a router, or circular saw. After removing old caulk, sand the wood on sides of seams with a piece of 80-grit sandpaper. Remove any debris in seams with a reefing hook, a brush and a vacuum or compressed air. Be sure that compressed air system has traps for moisture and oil.
4. Thoroughly clean and de-oil teak in seams with clean rags and acetone or denatured alcohol. Change rags frequently.
5. Primer Not Necessary
6. For best results, a bond breaker tape (3M 218 Fine Line) should be applied to the bottom of the seam before caulking. If priming, apply tape after primer has dried.
7. To begin caulking, cut the top of the caulking nozzle to fit in the seam; and puncture the inner seal. Squeeze the end of the nozzle with a pair of pliers to allow the tip to reach the bottom of the seam.
8. Apply SIS 440 to bottom of seam, allowing it to flow upward until crowning above the top of the seam. Smoothly pull the gun along the seam. Avoid starts and stops or changes in direction that may entrap air.
9. Immediately after application, draw a flexible putty knife over the seam, applying enough pressure to slightly bend the blade. The caulking should well up behind the knife in a slight crown. Entrapped air will "pop" and must be worked out of the seam before continuing. Remove excess caulk from the deck with a putty knife, leaving the seam bead undisturbed.
10. Allow caulking to cure at least 48 hours before proceeding. When caulking has cured, sand surface of deck to remove excess caulking with 80-grit sandpaper on a grinder with a soft pad. When sanding, hold pad flat against the deck and keep it moving to avoid sanding a depression into the deck surface.
NOTE: Paint and varnish do not adhere to caulking. Like any contaminant, small quantities of silicone or other residue from the caulk may cause 'fisheye' in wet paint. Thoroughly clean surfaces before painting.
Meets or exceeds Federal Specifications TT-S-00230C (COM-NBS) for one component building sealants and TT-S-001543A (COM-NBS) for silicone building sealants.
STORAGE: Store in a dry area at temperatures below 80 F. Use within 12 months of purchase.
CAUTION! Use with adequate ventilation. Contact with uncured product may irritate eyes. In case of contact, flush eyes with water for at least 15 minutes. Consult a physician. (Contact lens wearers should take appropriate precautions.) Avoid repeated and prolonged skin contact. Keep out of reach of children. For additional information, consult Material Safety Data Sheet.