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Interprotect 20003/micron csc help

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pooch692000 View Drop Down
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    Posted: 12 Apr 2013 at 6:08am
Need your advice:  sanded entire hull with 80 grit except where jackstands pads are..my sailboat has a 2.5-3 foot fin/bulb Stripped keel to bare lead and have applied 2000e as per instructions, 1st coat in less than hour, and 2 more coats on consecutive days.  No access to underside of keel to apply2000e as boat is on stands with full bottom of keel blocked. yard will apply 2 coats of micron over 2 days with boat on stands (they agreed to sand the 200e before applying the first coat of 2000e), so no micron on keel bottom or where the 4 pads are before saturday.

plan is for a week from this monday first launch by yard. yard will put boat in slings on late saturday before workers go home.   they dont launch sunday so i have access to bottom of keel for sat pm and all day sunday.   bottom will be done except for paintwhere pads are and barrier coat or paint on bottom of keel before she is put in slings..  

So here is my plan/dilemna.  Since boat can only be in slings sat pm and sunday and am launch monday and 2 coats of micron cannot be applied in one day, i need a game plan or advice.  here is what i was thinking:
 Saturday
  1)sand pads and apply 1 coat of micron
  2)grind bottom of keel, vacuum and 1 coat if 2000e.

Sunday
1) 2nd coat of micron to pads
2) keel - 2nd coat of 2000e in am
2) keel - 3rd coat of 2000e  and 1 coat micronafter thumb print test applied hot.

Boat is going to be first boat launched monday as it will be in straps  and immersion for micron is minimum 16 hours.  or is my other option to apply one coat of barrier coat sat pm and 1 coat of micron hot and 2n coat sunday????  remember there are already 3 coats of barrier coat on rest of keel and 2 coats of paint.

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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: 12 Apr 2013 at 8:08am
Pooch,
 
I suggest you get as many coats of Interprotect as possible on the bottom of the keel.  So, your original plan is what I would recommend.  Due to time constraints, it doesn't appear as though you would be able to get a 2nd coat of Micron onto the bottom of the keel. If you are only going to get one coat on the bottom of the keel, I suggest making sure you get a relatively thick coat on, using a 3/8" nap roller.  This should get you through 1 season. 
 
I suggest talking to your boat yard.  You are the customer, and they should be willing to work with you!  I know they have alot of boats to launch, but it is also their job to allow you to do necessary work on the boat!
 
Best regards,
Ken
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pooch692000 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pooch692000 Quote  Post ReplyReply Direct Link To This Post Posted: 12 Apr 2013 at 10:08am
thanks ken.  as long as i can get through the season, that'll be fine.  Maybe i can talk them into putting back on jackstands monday, launch other boats and getting it back in sling and do another bottom coat monday pm and launch tuesday, but of course, that aint free!!   

one other question.  so as to not rely on yard sanding the interprotect (the 3 coats i currently have on hull and keel) , can i sand it it this weekend and clean up and let yard just put the 2 micron coats this thursday and friday?  if so , what grit is best?  Or if better to wait til right before they paint on thursday, and rely on them doing it right?  if the yard does, it thursday, i'd need to give them details one what grit, how to clean and how long to wait after clenaing barriet coat residue off.  Thanks in advance!
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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: 12 Apr 2013 at 10:24am
Pooch,
 
We always recommend you hot coat your bottom paint over Interprotect if possible.  This will give you a superior chemical bond compared to the mechanical bond created by sanding.  Also, sanding Interprotect reduces the total dry film thickness, and if you don't have a 10 mils dry thickness, this wouldn't be considered a full barrier coat.  In this case, water intrustion could still be possible.
 
If you must sand the surface, I would suggest applying a total of 5 coats of Interprotect, and then sanding with 80 grit sandpaper.  Once sanding is completed, you would want to wipe the surface down with special thinner 216, using the 2 rag method.  Apply 216 with 1 clean rag and remove it with another.
 
Best regards,
Ken
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pooch692000 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pooch692000 Quote  Post ReplyReply Direct Link To This Post Posted: 12 Apr 2013 at 10:39am
thanks ken, but yard is only going to allow me to do pads and bottom of keel with antifoul by myself, so hot coating the rudder and the topside of keel above blocks,  were there are the 3 layers of 2000e is not an option. it is only barrier coated on the lead portion of keel and rudder.  the  2000e on rudder and keel has to be sanded since it will not be hotcoated given time constaints, so should i rely on yard to sand and clean the 2000e with 220 grit, clean and apply the micron once dry this coming thursday or should i sand the barrier coat  and clean with the 216 this weekend and have them just apply the micron on thursday?
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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: 12 Apr 2013 at 11:49am

Pooch,

I suggest you sand any Interprotect with 80 grit sandpaper.  Whether or not you want to sand the surface, or trust the yard is up to you.  There are no time constraints after sanding the product, but it is best to wipe the surface down shortly before applying your Micron.
 
Best regards,
Ken
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pooch692000 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pooch692000 Quote  Post ReplyReply Direct Link To This Post Posted: 18 Dec 2013 at 6:57am
Ken,
Boat was hauled and the yard wound up supposedly doing 2 coats of 2000e and one coat of micron csc.  After rubbing bottom a few times racing this season (sand), the underside of the wing keel is down to mostly lead again.  Also, there was some water isntrusion i.e bubbles on the leading edge of keel.  I was going to sand those parts off and reapply the 3 coats of 2000e.  The yard did not allow me to do the bottm of the wing keel.    can i assume that that water got under the barrier coat from where it had been "Sanded" off from hitting bottom?  If there had been 5 coats of 200e and 2 coats of the micron, would the bottom of keel still be back to bare lead?

 Also, the rubbing of bottom is typical around here with sandbars everywhere and tight racing, so would i be able to get away with just sanding bottom of keel to bare lead and then just doing the 2 coats of csc considering it will likely be sanded off again through the season?  Will the csc stick to eh lead?  I have a diver go under boat every 2 weeks anyway in season to clean bottom.  the bottom of keel rest slightly in mud at dock at low tides as well.  not sure if that affects the paint or barrier coat.  
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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: 18 Dec 2013 at 1:40pm
Pooch,
 
By not applying a full 10 mil barrier coat, you could certainly experience early paint failure and corrosion.  Corrosion can also form at exposed areas, and then "creep" under coatings.  As such, you really should have the full 10 mils on your entire keel.  I cannot say for sure whether the keel would have survived the impact, even if a full barrier coat was applied. 
 
Micron CSC should not be applied directly to lead.  Firstly, it will not adhere very well, and secondly, the electronic potential between dissimilar metals can actually reduce the fouling protection of the paint.  This is known as burnback: The copper biocide reacts sacrificially with the lead.  Interprotect 2000E acts as a barrier between the coating and the substrate.
 
-Ken
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fstbttms View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fstbttms Quote  Post ReplyReply Direct Link To This Post Posted: 28 Dec 2013 at 8:56pm
Originally posted by pooch692000 pooch692000 wrote:

the bottom of keel rest slightly in mud at dock at low tides as well.  not sure if that affects the paint or barrier coat.  

Repeated immersions in mud will render the paint in that area ineffective.
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