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Hayden-C30 View Drop Down
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    Posted: 06 Aug 2013 at 10:05am
I am repainting the aluminum mast on my 1988 sailboat.  The manufacturer has told me that it was painted with a 2-part Polyurethane paint which is in good condition and I plan to use Perfection to recoat.  There are small lifted areas at many of the hardware attachment points due to the SS screws.  I would like to just use 2000E over the bare metal and as a full prime coat over the existing finish then go straight to 3 coats of Perfection without a sanding primer.  I will not be long boarding or worrying about minor imperfections.  My questions are
1.  What grit should I use to sand the old paint to give it tooth for the 2000E.  In previous posts I have seen everything from starting with 60 to 220.  I will feather edge all locations that go to bare metal but what about the areas where the old paint is in good shape?
2.  Can I spray with HVLP equipment.  if so, which thinning agents do I need.
3.  I read the previous post titled "Repainting previously painted aluminum mast" dated 30 Jan 2013.  In it you call for 2316N for all steps except for reducing for brushing/rolling.  If I roll and tip, can I use the 2333N for all steps or do I need 2316N for everything except for thinning the top coats for brushing.
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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: 06 Aug 2013 at 12:06pm
Hayden-C30,
 
Please see my answers in red:
I am repainting the aluminum mast on my 1988 sailboat. The manufacturer has told me that it was painted with a 2-part Polyurethane paint which is in good condition and I plan to use Perfection to recoat. There are small lifted areas at many of the hardware attachment points due to the SS screws. I would like to just use 2000E over the bare metal and as a full prime coat over the existing finish then go straight to 3 coats of Perfection without a sanding primer. I will not be long boarding or worrying about minor imperfections. My questions are
1. What grit should I use to sand the old paint to give it tooth for the 2000E. In previous posts I have seen everything from starting with 60 to 220. I will feather edge all locations that go to bare metal but what about the areas where the old paint is in good shape? I suggest sanding areas that are bare metal with paper in the 60-80 grit range, as Interprotect requires a rough surface area to adhere well to metal.  The existing paint should be sanded with 120-180 grit sandpaper prior to application of Interprotect.
2. Can I spray with HVLP equipment. if so, which thinning agents do I need.
Interprotect 2000E and Perfection can certainly be sprayed with HVLP equipment, but we do not recommend doing so.  HVLP setups fail to fully atomize these products, leaving an orange peel finish.
3. I read the previous post titled "Repainting previously painted aluminum mast" dated 30 Jan 2013. In it you call for 2316N for all steps except for reducing for brushing/rolling. If I roll and tip, can I use the 2333N for all steps or do I need 2316N for everything except for thinning the top coats for brushing.  2333N is used for brush and roll application of 2 part products, where 2316 is used for spray application.  2316N can also be used to thin Interprotect 2000E for brush and roll application to small areas.
 
Regards,
Ken
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Hayden-C30 View Drop Down
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Thanks for the reply.  If I am roll/brush tip I need the 2333N.  Can I use that for everything 2000E thinning & cleanup) and not get any 2316N?  I have about 100 - 120 SF of mast and boom.  I plan on getting 2 qts of 2000e and 1 qt. of Perfection.  does that sound about right?  how much 2333N will I need to go along with that?
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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: 06 Aug 2013 at 12:51pm
HAyden,
 
2333N can certainly be used for clean up and wipe down of sanded surfaces.  I figure you will need 2 quarts per coat for Interprotect 2000E, and 1 quart per coat of Perfection, assuming your 120 sq. foot number is right.  When rolling and tipping, We recommend thinning these products 10-20%, and you will use a large amount of solvent for wipedown, so at least 2 quarts would be needed.
 
I forgot to address this before:  Did you plan on not sanding the Interprotect prior to application of Perfection?  This is doable, but leaves a very ugly looking finish annd is not something I would recommend in any case. 
 
I recommend sanding the Interprotect smooth with 220 and then 320 prior to application of Perfection to insure a nice glossy finish.
 
Regards,
Ken
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hayden-C30 Quote  Post ReplyReply Direct Link To This Post Posted: 06 Aug 2013 at 1:48pm

Thanks.

the existing paint is in pretty good shape so there are only small percentage that is bare aluminum.  So it looks like for 2000E I will have 2-coats on bare spots and 1 full coat over good paint so 2 qt. total.  1 qt for Perfection  that will take .6 qt at 20% and leave 1.4 qt for clean up.  does that sound about right?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ken@Interlux Quote  Post ReplyReply Direct Link To This Post Posted: 06 Aug 2013 at 2:26pm
Hayden,
 
That is correct!
 
-Ken
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Hayden-C30 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hayden-C30 Quote  Post ReplyReply Direct Link To This Post Posted: 06 Aug 2013 at 8:07pm
On a related subject, my mast step, mast head and boom end caps are anodized aluminum castings.  they were black but now they look bad.  what is the recommended way to spruce them up and make them nice and black again.  http://www.catalinadirect.com/index.cfm?fuseaction=product.display&product_ID=961&ParentCat=627  
I will have the 2000E but would rather not buy a full quart of black Perfection.
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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: 07 Aug 2013 at 7:12am
Hayden,
 
If you don't want to buy a full quart of black Perfection, you could buy a half pint of the Black Brightside Boot Top and Striping Enamel.  Being a 1 part paint, it won't be as durable as Perfection, but will certainly be durable enough to last for 3-5 years before you notice decreased gloss levels. 
 
Directions would be as follows:
1. Degrease the surface with Special Thinner 216, 2316 or similar. 
2. Sand the surface with 60-80 grit sandpaper.
3. Remove sanding residue by brushing off, blowing with a clean air compressor line, or vacuuming.
4.  Immediately apply 1 coat of Interprotect 2000E/2001E thinned 15-20%, thinned with 2333N
5. Apply 1-2 additional coats of Interprotect 2000E.  Allow the last coat to cure overnight and sane with 220 grit sandpaper.  Overall appearance can be improved by sanding in between each coat. 
6.  Apply 2-3 coats of Brightside Boottop and Striping enamel.  This product MUST be sanded in between coats.  When sanding, always make sure to remove any sanding residue by wiping down with a solvent.  Note:  2333N or 2316N are not acceptable for wiping down surfaces painted with Brightside, as the solvents contained in those products are strong ketones, and will remove the Brightside!  Instead, use Special Thinner 216 or Brushing Liquid 333.
 
I hope this helps!
 
-Ken


Edited by Ken@Interlux - 07 Aug 2013 at 7:13am
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