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Ancbob View Drop Down
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Joined: 09 May 2013
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    Posted: 10 May 2013 at 4:21am
I have a 1977 catalina 22 that I am in the process of restoring. I have pulled the cast iron keel. I ground the old compound off down to the metal. Then I treated the bare metal with rust protectant. For fairing compound I used lightweight auto body filler. The fairing process is nearly completed. On a friends advice I purchased 2000e for the barrier coat. My question is, can I apply this directly over the filler, or should there be something between the filler and the interprotect 2000e? I am planning on vc17 over the 2000e for bottom paint. This boat will be moored in fresh water over the summer. I am new to this process of fairing, so any advice would be appreciated.
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Ken@Interlux View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken@Interlux Quote  Post ReplyReply Direct Link To This Post Posted: 10 May 2013 at 9:54am
Ancbob,
 
Unfortunately, I see a few issues with the steps you have taken thus far.
 
Firstly, I see you used a rust protectant.  What type of rust protectant did you use?  Generally, these products contain waxes, parrafins and silocon products, which will keep paints from properly adhering.
 
Secondly, you are using auto body filler for a keel that will be submerged.  Generally, auto body fillers are not water resistant enough for below the waterline marine use. 
 
 
Our recommendation for your project is as follows:
 
1.  Grit blast, grind or sand the entire keel down to bare metal.  Use 40-60 grit sandpaper or a 36 grit disc.  Bring the entire surface to a shiny metal finish.
 
2. Remove sanding residue by brushing off, using a clean air line or a vacuum.
 
3. Immediately apply 1 coat of Interprotect 2000E thinned 15-20%.  Apply the primer within 1 hour of abrading, before any surface contamination or corrosion can occur.
 
4.  Apply another coat of Interprotect, unthinned.  Follow the overcoating directions for Interprotect 2000E.  Interprotect can be overcoated with another coat of Interprotect when the 1st coat becomes tacky where you can leave a thumb print in the coating and not get paint on your finger.
 
4. Fair the surface with Watertite Epoxy Fairing compound.  This can be applied 4-18 hours after the Interprotect is applied.
 
5.  Sand any areas that you are fairing.  Sand smooth with 80 grit sandpaper.  For fairing, a longboard or block sander will make leveling easier.  IF you happen to sand through the primer, it is in your best interest to immediately apply some Interprotect 2000E.
 
6.  Apply additional coats of Watertite fairing compound.  Sand with 80 grit.  Remove sanding residue by wiping down with 2333N.
 
7.  Apply 4 additional coats of Interprotect 2000E, unthinned.
 
8. When the Inteprotect 2000E is fully cured, sand the entire keel smooth up to 320 grit sandpaper.  It will be easier to smooth the surface if you start sanding with paper in the 120-150 grit range!
 
9.  Apply 2-3 coats of VC-17M
 
If you have any other questions, please ask Tongue
 
-Ken
 
 
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