Sealing teak boat decks with SABA Seal One Fast

Transcription

1 Info sheet 203 Sealing teak boat decks with SABA Seal One Fast Industriestraat 3, NL-7091 DC Dinxperlo, Postbus 3, NL-7090 AA Dinxperlo, Visiting address: Weverstraat 6, NL-7091 CM Dinxperlo, Tel +31 (0) , Fax +31 (0) , Internet, Trade register Arnhem Version EN, all earlier versions hereby expire

2 Page 2 of 10 - Info sheet 203 Sealing teak boat decks with SABA Seal One Fast, version EN 1. Introduction The SABA Marine range consists of various bonding and sealing for the professional yacht builder. See info sheet "Bonding and sealing for ship building" for a summary. This info sheet outlines how joints between wooden (teak) sections on boat decks are sealed using SABA. 2. Rubber deck seams SABA Seal One Fast is a durable, elastic single-component (MS-polymer) deck-joint rubber for sealing joints in teak boat decks. SABA Seal One Fast is resistant to fresh and salt water, and provides a fine finish to boat decks. The illustration below shows how SABA Seal One Fast is applied. Sealing boat decks with SABA Seal One Fast Specific properties - Can be sanded within 1 to 2 days (at 23 C and 75 % relative air humidity) - Good ageing resistance - Does not form bubbles during hardening and polymerisation. 3. Before starting work 3.1 Dimensions of joints The following dimensional requirements have been set for the joints in the teak to be sealed. As a rule of thumb, the joint width between teak sections must be approximately 10% of the width of the teak sections, 5 mm minimum. The table below shows an overview of the applied joint widths and the joint depth for the various sizes of the teak.

3 Page 3 of 10 - Info sheet 203 Sealing teak boat decks with SABA Seal One Fast, version EN Wood width (mm) Minimum joint width (mm) Minimum joint depth (mm) Joints may be no wider than 10mm, because of the high risk of mechanical damage. 3.2 What to seal? To acquire a water-tight deck it is important that all teak sections and the adjoining materials are sealed. These include: - Parallel joints between teak deck sections - Joints between the end sides of teak deck sections - Connecting joints between deck sections and other materials Consult the "Constructive bonding and sealing with SABA Sealtack 780" Info sheet for sealing the teak-hull joints. 3.3 Refit and repair Poor, damaged joints must be removed completely. Clean the surrounding bonding surfaces so that the new sealant can be applied to clean teak. The joint must then be built up from the start. 4. Applying the primer and tape A step-by-step description can be found below of how primer and sealant should be applied. See the drawing in the supplement. Remarks: - Allow a deck bonded with SABA Deckfast MS to harden sufficiently before sealing it with SABA Seal One Fast. Take the weather conditions into account, temperature and air humidity especially influence the processing and hardening speed (2 mm / 24 hours at 23 C and 75% relative air humidity). - Work in a moisture and dust-free environment. - Always use primers and cleaners suitable for the sealant. Consult the primer table at the back of this info sheet.

4 Page 4 of 10 - Info sheet 203 Sealing teak boat decks with SABA Seal One Fast, version EN 4.1 Cleaning the teak Bonding surfaces must be clean, dry and free of dust and grease. Remove loose dust particles. Use a clean cloth (which does not fluff) or a brush and SABA Cleaner 21 to de-grease the teak. 4.2 Activity Sheet Prior to and during the application, register the conditions, used, batch numbers and work on the SABA Marine activity sheet. This helps to safeguard the quality of your project. Remarks: - The air temperature during processing must be at least 5 C. - The temperature of the surface must be at least 3 C above the dew point. The dew point can be derived from the ambient temperature and the air humidity. - The bonding surfaces must be sufficiently dry and the moisture percentage may be 15% (for teak 14%) at the most. The moisture percentage can be measured with a 'protimeter' or similar device. - See also the Info sheet "Humidity measurement and dew point determination". 4.3 Priming bonding surfaces Apply one layer of SABA Primer S1 using a brush. Allow it to dry thoroughly and apply the deck-joint rubber within the open time of at least 30 minutes and no more than 180 minutes. Consult the primer table at the back of this info sheet for the primers to be used on materials other than teak. Comment: - After de-greasing, allow the solvent to evaporate completely before applying the primer. 4.4 Apply masking tape In three-point bonding, the sealant bonds to both sides as well as to the bottom of the joint, whereby the movement of the joint is limited. Avoid three-point bonding by using SABA Deck tape at the bottom of the joint - applying it after the bonding surfaces have been primed and dried. 5. Applying the deck-joint rubber and sanding 5.1 SABA Seal One Fast Activity Sheet Prior to and during the application, register the conditions, used, batch numbers and work on the SABA Marine Activity Sheet. This helps to safeguard the quality of your project. The activity sheet has space for a situation diagram, which shows the sections of the deck where the sealant has been applied.

5 Page 5 of 10 - Info sheet 203 Sealing teak boat decks with SABA Seal One Fast, version EN Remarks: - Protect your work from direct sunlight and rain during application. - Air temperature during application must be at least 5 o C. - The temperature of the surface must be at least 3 C above the dew point. The dew point can be derived from the ambient temperature and the air humidity. - The bonding surfaces must be sufficiently dry and the moisture percentage may be 15% (for teak 14%) at the most. The moisture percentage can be measured with a 'protimeter' or similar device. - See also the "Humidity measurement and dew point determination" Info sheet. 5.2 Sealing Use a nozzle which has been cut at a 45 angle and which fits into the joint exactly. Trapping air can be avoided by applying the sealant from the bottom of the joint to the top. Comment: - Overfill the joints. - Use a filling knife to uniformly level the joints and flatten to approximately 2 mm above the teak sections. Do not apply pressure when doing so. - If application of the sealant is continued after a break, one must ensure that there is no air trapped. So always apply "sealant in sealant". 5.3 Hardening system The hardening speed is dependant on the temperature and air humidity. As a rule of thumb, SABA Seal One Fast hardens in 2 days at 23 C and 75 % relative air humidity. Hardening will take considerably longer at lower temperatures or lower relative air humidity Relative air humidity can be measured by placing a hygrometer in the work environment. The graph below shows the estimated hardening time of SABA Seal One Fast at 75 % relative air humidity (rah.) at different temperatures.

6 Page 6 of 10 - Info sheet 203 Sealing teak boat decks with SABA Seal One Fast, version EN Estimated Hardening Time of SABA Seal One Fast at 75 % rah. Time (hours) Temperature ( C) 5.4 Sanding the deck Important: The deck may only be sanded after SABA Seal One Fast has completely hardened! As a rule of thumb, SABA Seal One Fast hardens in 2 days at 23 C and 75 % relative air humidity. See paragraph 5.3. Cut away excess material using a chisel or sharp (filling) knife. Sand the deck with a rotating and oscillating motion or diagonally (at an angle of 45 maximum) to the longitudinal direction. Work from medium rough (grain 120) to fine (grain 240, for example) sandpaper. Never sand across or along the joints! 6. Deck maintenance Use only fresh or salt water or perhaps a neutral biologically-degradable soap to revive greying or weathered teak boat decks. Do not use aggressive or acidic.

7 Page 7 of 10 - Info sheet 203 Sealing teak boat decks with SABA Seal One Fast, version EN 7. Primer tables 7.1 SABA Seal One Fast Primer table The table below shows which primers should be used with SABA Seal One Fast. Surface Suitable Primer Hull constructions Steel plate SABA Primer 9102 Aluminium SABA Primer 9102 Stainless steel SABA Primer 9102 Polyester SABA Primer 9102 Epoxy resin SABA Primer 9102 Deck Teak SABA Primer S1 Exterior Stainless steel (deck fittings) SABA Primer 9102 Untreated teak (gunwale) SABA Primer S1 Wooden stair treads SABA Primer S1 Paint/Coating PU coating SABA Primer 9002 Epoxy primer SABA Primer 9102 Awlgrip primer SABA Primer 9002 Awlgrip topcoat SABA Primer 9002 Alkyd paint SABA Cleaner Open times for SABA Primers and Cleaners Primer or Cleaner Open time minimum maximum SABA Primer minutes 4 hours SABA Primer minutes 24 hours SABA Primer S1 30 minutes 3 hours SABA Cleaner minutes n.a. SABA Cleaner minutes n.a.

8 Page 8 of 10 - Info sheet 203 Sealing teak boat decks with SABA Seal One Fast, version EN 8. References - SABA Seal One Fast Safety data sheet - SABA Seal One Fast Product sheet - SABA Primer S1 Safety data sheet - SABA Primer S1 Product sheet - SABA Cleaner 21 Safety data sheet - SABA Cleaner 21 Product sheet - Constructive bonding and sealing with SABA Sealtack 780 Info sheet - Humidity measurement and dew point determination Info sheet

9 Page 9 of 10 - Info sheet 203 Sealing teak boat decks with SABA Seal One Fast, version EN Supplement: SABA Seal One Fast application drawings Empty joint Applying SABA Primer S1 to bonding surfaces. Applying SABA Separation tape to the joint bottom, to avoid three-point bonding. Overfilling the joints with SABA Seal One Fast. Avoid trapping air by filling the joint from bottom to top. Use of a filling knife to uniformly level the joints. Do not apply pressure when doing so. Remove excess material after hardening using a sharp filling knife or chisel, and then sand.

10 Page 10 of 10 - Info sheet 203 Sealing teak boat decks with SABA Seal One Fast, version EN SABA Marine activity sheet A. Project data: Work carried out by: Date: / /. Location:. Project name:. Project nr:. Eventual "prior" sealing system (only mention when old seal is replaced): B. Preparation: Product Batch number(s) Information SABA Cleaner 21 SABA Cleaner 48 SABA Primer Marine SABA Primer S1 SABA Primer 9002 SABA Primer 9102 Comments: C. Processed : Product Packaging Total Batch number(s) SABA Deckfast MS SABA Seal One Fast Sabaflex 500 SABA Sealtack 700 SABA Sealtack 751 SABA Sealtack 780 D. Measured application conditions: Activity Bonding Priming Sealing Time Air temperature ( C) Relative air humidity (%) Dew point ( C) from table Temperature of bonding surfaces ( C) Humidity content of bonding surfaces (%) Consult the Humidity measurement and dew point determination Info sheet for additional information Work situation: open air conditioned D. Situation diagram / comments: