SJ23 Tech Tip G05, (Updated 2017-03-12) Bob Schimmel

Index

Sikkens Cetol Marine Preparation Guide.

Ever since I was introduced to Sikkens Cetol Marine in 1995 I've been so impressed with it that I've recoated all the bright work on Panache.  That took a couple of years considering weather conditions, etc.  In 1999 I coated my tiller four coats, scraping it down to bare wood.  That took a fair amount of effort.  Two years later and the finish is still perfect with no sign of peeling or wear.  But in 2002 I finally applied the first maintenance coat which I now try to do annually.  An ounce of prevention being worth a pound of cure and all that.

The real beauty of this product is: 

  • Sheds liquids like water off a duck's back.

  • Passes vapour one way only, OUT, just like Gortex. 
    This breathing property guarantees that all water vapour passes out of the wood into the atmosphere.  This maintains the residual moisture content of the wood at its optimum.  It's the expanding vapour in the hot sun that lifts varnish and other solid coatings off the surface.

  • Four coats is a 100% UV block.

  • It wears very well under foot. 
    There is a version for vertical surfaces and another for horizontal.

  • NO sanding between coats, only washing with soap to make sure the surface is clean for good adhesion. 
    However, if there are tiny bumps or pointy things it is OK to do a light scrub with a Scotch Brite pad between coats.

  • Cetol Marine is 100% compatible with Sika-Flex adhesives which is perfect for bright work installed on a deck to ensure that no water creeps under it to soak into the wood. 
    However, all wood should still be installed on top of a thin plastic spacer to keep it high and dry off the deck.  It is quite OK to apply a fillet of Sikaflex over the spacer to hide it. 

  • Requires an annual maintenance coat depending on the climate or severity of service it is exposed to.
    May be extended to 2 years with exposure to mild weather.

  • If you want to make a non-skid top coat for areas that are exposed to water spray, sprinkle some fine dry mason's sand on the second coat while it is still wet.  Use a salt shaker with large holes and sprinkle lightly.  Apply a top coat of Cetol Marine over the sprinkled grit to lock the sand in.  If the finish is too coarse then add more coats of Cetol Marine till it imbeds the sand to a texture you like.  The deeper the sand is imbedded, the stronger the bond.  This is especially important for wood steps on your boarding ladder or the companionway steps into the cabin.

This remarkable combination of properties prevents the coating from lifting off like varnish does.  But no matter how good a product is, preparation is everything.  In fact when the Canadian technical representative attended one of our sail club meetings, more than three quarters of the discussion time was focused on wood  preparation.  So click on the preparation guide pages below to learn more about it.

  • Prep Guide Page 1 - Preparation Procedures.

  • Prep Guide Page 2 - Preparation Procedures, Cont'd.

  • Prep Guide Page 3 - Areas of use & Maintenance Procedures.

  • Prep Guide Page 4 - Application Procedures.

NOTES

  1. Stir the Cetol often as you apply it.  This brings the UV blocking compound up from the bottom of the can.

  2. Don't shake the Cetol.  This introduces air bubbles that may end up on your finished work.

  3. The original Sikkens Cetol finish from 1995 is now available as Sikkens Cetol Marine.  I have two cans of the marine version and treat them like gold.

  4. The none marine version of Cetol has a milky colour that I use for land based projects.  The milky stuff must be stirred every 5 minutes to keep the UV block in suspension.  This ensures an even application of UV block over the project. 

  5. Sikkens Cetol Marine is available at select qualified retailers only.  From what the factory representative told me, a retailer must pass an authorized painting course to be qualified to sell Cetol Marine.  Akzo Nobel is the parent company.  You can find them on the web at Sikkens
     

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