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South African "Catalina" 22

Discussion in 'Catalina 22' started by greg_m, Jul 31, 2017. Add this thread to a FAQ

  1. greg_m

    greg_m

    Joined May 23, 2017
    224 posts, 56 likes
    Catalina Jaguar 22
    ZA Cape Town, South Africa Simons Town
    This was round two on the water line as well as trying to tackle the troughs in the below waterline area at the bow. Will slowly make my way aft filling the voids as best i can. The boat will never be as new shape from the mould unfortunately.
     

    Attached Files:



  2. rpludwig

    rpludwig

    Joined May 23, 2016
    334 posts, 147 likes
    Catalina 22 #12502
    US New Bern, NC BSC


    Last edited: Dec 8, 2017
  3. greg_m

    greg_m

    Joined May 23, 2017
    224 posts, 56 likes
    Catalina Jaguar 22
    ZA Cape Town, South Africa Simons Town
    Thanks for the link. I had in fact purchased one of those floor carpet glue spreading trowels with the serrated edge with exactly the idea of spreading the fairing compound over a larger surface area but only leaving thin lines of compound. Then long board sanding the hull to knock off the high spots leaving behind the troughs of ridges. Then only filling in the areas where the ridges are left over. I never tried it because I thought it was a daft idea. Now I read in the link to the forum you posted, post #6 from JimConlin, that somebody else recommends this process... so now I am keen to try it out.

    Will definitely take photo's of the process when I get to do this job. Problem is the good old Cape Doctor is at it again... excess of 30 knots gusting into the 40 knots making working on the hull impossible. To much sand and leaves blow onto the hull as well as the actual sea spray carry over leaving every surface a wet smudgy sticky sandy messy. No good for fresh epoxy resin and fairing compound. :(
     


  4. greg_m

    greg_m

    Joined May 23, 2017
    224 posts, 56 likes
    Catalina Jaguar 22
    ZA Cape Town, South Africa Simons Town
    On Sunday last, 10/Dec?2017, the Volvo Ocean racers left Cape Town on the next leg to Australia. They felt the full force of the wind once passing around Cape Point! 5 Knots to 50 Knots in the space of an hour was the comment made by the race commentators! Just our daily breeze....

    Check out the in port race on the 8th:
    and the departure on the 10th:

    Hectic action!
     


  5. greg_m

    greg_m

    Joined May 23, 2017
    224 posts, 56 likes
    Catalina Jaguar 22
    ZA Cape Town, South Africa Simons Town
    Ok... so finally the wind calmed down enough to make a start using the new plan. Using 80 grit I long board sanded the entire starboard side of the hull from the waterline to the keel line following only the length of the boat. Then washed it all down. This took a couple of hours after work yesterday evening. In the pictures you can see clearly the valleys and the hills.

    The valleys are the darker mottled areas while the hills are the lighter areas. The much whiter areas forward and along the waterline are whats been faired already and in my opinion completed! Time to move on...
     

    Attached Files:



  6. greg_m

    greg_m

    Joined May 23, 2017
    224 posts, 56 likes
    Catalina Jaguar 22
    ZA Cape Town, South Africa Simons Town
    This is the glue spreading trowel used for laying down carpet or vinyl flooring. Never used it before!

    The idea is to lay down a thin smooth layer and then scrape it down with this trowel leaving behind ridges to sand off.
     

    Attached Files:



  7. greg_m

    greg_m

    Joined May 23, 2017
    224 posts, 56 likes
    Catalina Jaguar 22
    ZA Cape Town, South Africa Simons Town
    After smoothing on a thin layer of fairing compound it was time to try the serrated edge trowel. First go was not so successful, scraped it all off and redid the thin layer. Reason being the tight radius cross wise and the curve of the hull lengthwise. Had to learn to concentrate on keeping the trowel parallel with the curve along the length of the hull while dragging it straight down the radius of the curve. Turned out ok for my first try.

    You can clearly see ridges where the fairing compound was left behind, valleys where the hull is visible on high spots and a couple of areas where no ridges are which shows really low spots. Used slow hardener so I had time to play around and cater for mistakes/trial and error!

    It got quite late in the evening so the low level setting sun was reflecting off the hull a bit in the last photo's.
     

    Attached Files:



  8. greg_m

    greg_m

    Joined May 23, 2017
    224 posts, 56 likes
    Catalina Jaguar 22
    ZA Cape Town, South Africa Simons Town
    It was then time to really take advantage of the lull in the wind and do some real work!

    A quick dip in the splash pool, break out the Weber and bbq some chicken for supper... brandy and ginger ale on the rocks to quench my thirst!
     

    Attached Files:



  9. greg_m

    greg_m

    Joined May 23, 2017
    224 posts, 56 likes
    Catalina Jaguar 22
    ZA Cape Town, South Africa Simons Town
    Ok - feedback time.

    IMHO = It is my honest opinion that this idea of using a serrated trowel and building up fairing compound using ridges and troughs would be great for changing the contours of the surface... NOT for filling low spots.

    Why do I say this from my experience? I spent more time sanding down unwanted ridges. During this time I did see that you have a lot of possibility for shaping a new curve or contour because of the height of the ridges. But sanding ridges away where you actually don't want them is not only a waste of time and effort but also a waste of materials. I even resorted to using my belt sander to get rid of the most of the unwanted ridges.

    I could far more quickly use a wide flat edge trowel to scrape away the excess on the high spots of the hull and leave only materials behind in the low spots. Lot less material waste, lot less time sanding. Even if I had to do this several times to build up to a flatter surface it would work out much easier to do.

    Again my opinion and also why I was hesitant to try it in the first place.

    Now to file off the serrations along the one long edge of my trowel!
     

    Attached Files:



  10. Hayden Watson

    Hayden Watson

    Joined Apr 5, 2009
    396 posts, 62 likes
    Catalina '88 C30 tr/bs
    US Oak Harbor, WA
    You would be better off with a 12" drywall taping trowel. https://www.homedepot.com/p/Wal-Board-Tools-12-in-Taping-Knife-20-042/100660210
    The blade is a thin sheet of stainless steel which is stiff but will allow some flex. When you are working on a curved surface you hold the trowel with both hands and use the last pinky and ring fingers of each hand to flex the ends of the blade to fit the curvature of the hull.
     


    greg_m likes this.
  11. greg_m

    greg_m

    Joined May 23, 2017
    224 posts, 56 likes
    Catalina Jaguar 22
    ZA Cape Town, South Africa Simons Town
    I did exactly that... except here in SA we have a "Builders Warehouse". I purchase a trowel that you describe exactly. I also used it exactly the way you described.

    Not only was I able to fill voids more easily, there was also way less wastage. In fact I used only 200g of fairing compound to complete the whole remaining starboard side = about 4m length. And all I did was exactly what I wanted to do = fill the valleys. Not reshape the hull.

    The previous section I tried with the serrated trowel leaving ridges took 200g of materials and barely made it half a meter length of the boat.

    Picture will follow soon...
     


  12. greg_m

    greg_m

    Joined May 23, 2017
    224 posts, 56 likes
    Catalina Jaguar 22
    ZA Cape Town, South Africa Simons Town
    After the sanding down of the ridges I decided to wash down the hull and scope out the shape and fairness while it was all glossy wet. I must say to me you can clearly see the difference between the faired parts and the unfaired parts of the hull. It looks way better than I expected of my own efforts. Unfortunately the camera does not really bring out the true details but here's the best of the shots I took anyways.
     

    Attached Files:



  13. greg_m

    greg_m

    Joined May 23, 2017
    224 posts, 56 likes
    Catalina Jaguar 22
    ZA Cape Town, South Africa Simons Town
    Ok - so the promised pictures. I started applying the fairing compound next to the section where the ridges were. Just to see if the new plan would prove any better. I think so! Check it out...

    The new section is given a light sanding to remove any crap from wind debris, washed down and then cleaned with Acetone.
     

    Attached Files:



  14. greg_m

    greg_m

    Joined May 23, 2017
    224 posts, 56 likes
    Catalina Jaguar 22
    ZA Cape Town, South Africa Simons Town
    Then next morning I decided I liked the results so prepped the remainder of the starboard side and applied fairing compound in the same way. It got a bit tricky in areas where there were multiple curves which look flat from one direction but completely hilly from another direction. The boat will never be perfect but all I am aiming for is to fill the voids as best as I can.

    Photo 126 and 129 shows this very well. The trailer must have put a hole through the hull at some stage. This was then clearly repaired on the trailer so although the hull has a convex curve the repair is concave = a big ding in the hull! The compound must be all of 1cm thick just to make it flat never mind bring it up to match the hull curve. So it will stay a bit flat in that area but looks a shiteload better than not fairing it out!

    Used the leftover compound to even start the port side waterline area!
     

    Attached Files:



  15. greg_m

    greg_m

    Joined May 23, 2017
    224 posts, 56 likes
    Catalina Jaguar 22
    ZA Cape Town, South Africa Simons Town
    Except for final sanding and finishing touches I think the major fairing work (that I want to do) on the starboard side is done! Now onto the port side... weather/holidays/family activities permitting.

    So I'm thinking this will be my last entry before Christmas so wishing ya'awl happy holidays/festivities/Christmas...whatever floats your boat!

    upload_2017-12-19_15-4-3.jpeg
     

    Attached Files:



  16. rpludwig

    rpludwig

    Joined May 23, 2016
    334 posts, 147 likes
    Catalina 22 #12502
    US New Bern, NC BSC
    well done and lookin good!, give yourself a pat-on-the-back, enjoy the holidays/family time, and give your power tools some time off as well! :thumbup:
     


    greg_m likes this.

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