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Epiglass Overcoating

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bluemoon View Drop Down
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    Posted: 02 Apr 2011 at 12:23pm
We stripped our blistered hull beyond the gelcoat down to the chopped mat, ground out the blisters, and filled the larger craters with cloth and vinylester resin.  After 6 months our hull is finally dry. Our plan is two coats of Epiglass then 10 mils of Interprotect 2000 followed by bottom paint. Now the questions: 1) Some fairing and filling still remains to be done. Should this be done now with epoxy filler directly on to the bare fiberglass or after/between the coats of Epiglass? 2) Can Interprotect 2000 be overcoated onto Epiglass using the Thumbprint test to avoid sanding the cured Epiglass?  3) Using a roll and tip application, how much coverage can I expect from a gallon of Epiglass using standard hardener?  Anything else you can think of?  I am an enthusiastic Interlux user and appreciate your wonderful product line.  Thanks.
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Jay@Interlux View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jay@Interlux Quote  Post ReplyReply Direct Link To This Post Posted: 06 Apr 2011 at 3:55pm
Hi,
I would recommend that you apply the (2) coats of Epiglass and allow that to dry for atleast 3-7 days. You will then want to wash the Epiglass with warm water, soap and a stiff brush to remove all amine blush from the surface. Unfortunately I would recommend that you do not apply the 2000E over the Epiglass while it is tacky as this window will be extremely short and quite hard to really meet the window, which could then result in detachment. At this point I would recommend that you begin to complete your filling/fairing. You will then need to sand that filler with 80 grit paper and remove all sanding residue with 202. You will now be ready to apply (4-5) coats of InterProtect  2000E. Lastly you can finish off with your bottom paint. With regards to the expected coverage of Epiglass I woudl estimate that you will achieve 550 sq ft per gallon mixed. Also the following link will bring you to our InterProtect Bulletin which will provide you with step by step instructions on this system: http://www.yachtpaint.com/LiteratureCentre/interprotect-tb-usa-eng.pdf
 
Hope this helps!
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bluemoon View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bluemoon Quote  Post ReplyReply Direct Link To This Post Posted: 11 Apr 2011 at 6:23pm
Thanks!  It is this kind of product support that keeps me using your products.
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Jay@Interlux View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jay@Interlux Quote  Post ReplyReply Direct Link To This Post Posted: 12 Apr 2011 at 4:04pm
Sounds great and glad we could help and thanks for the support!
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ripard View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ripard Quote  Post ReplyReply Direct Link To This Post Posted: 29 Feb 2012 at 3:17am

Hi Jay

I have a similar question to the above. I used a grinder to remove the gelcoat achieving a reasonably smooth layer of fibreglass (in most of the hull anyway). Therefore I have initially only applied epiglass on those patches where I have applied the first layer of Interfill 830. My intention was to finish the patches of fairing and then apply a coat of epiglass over the smooth finish.

My first question is whether it is ok to apply epiglass over Interfill? Will it attach ok?

Also is it advisable/necessary to apply Interfill across the whole hull? Some advice at the yard was that this is necessary even though most of the fibregalss on the hull is smooth.

Also, I have repaired a couple of air voids with fibreglass and standard resin. I would like to ask if I should expect the Epiglass to attach to these repairs without any problem?


I note your advice above and was wondring whether I should remove the filler and start over by applying Epiglass and letting it sit for a week so as to avoid the issue with ensuring correct timing to apply the filler over tacky Epiglass. 


many thanks in advance


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Jay@Interlux View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jay@Interlux Quote  Post ReplyReply Direct Link To This Post Posted: 29 Feb 2012 at 10:16am
Please see below, I have copied each of your questions and supplied responses in red.

My first question is whether it is ok to apply epiglass over Interfill? It is physically possible to apply Epiglass overtop of a filler such as Interfill 830. However there really will be no additional benefit when doing so, as the Interfill 830 will still be required to be sanded with 80 grit paper and wiped clean with 202 prior to applying the Epiglass and that Epiglass really will provide you with no additional benefit. Will it attach ok? As long as the Interfill 830 has been sanded with 80 grit paper and wiped clean with 202, then yes it will hold just fine. However it will not hold if applied while the Interfill 830 is just tacky or if it had not been sanded.

Also is it advisable/necessary to apply Interfill across the whole hull? Interfill 830 will not be required across the entire hull, unless there are voids/imperfections across the entire hull itself. Therefore you can simply take of the voids/imperfections only and be just fine or you can cover the entire hull for precautionary reasons to ensure that you do not sand through in some areas, which is likely where the advice from the yard had come from. Some advice at the yard was that this is necessary even though most of the fibregalss on the hull is smooth.

Also, I have repaired a couple of air voids with fibreglass and standard resin. I would like to ask if I should expect the Epiglass to attach to these repairs without any problem? As long as that resin has fully cured, you have wash the surfaces with warm soapy water and a stiff brush, then sanded the resin with 80 grit paper and removed all sanding residue with 202 then you will be just fine. However, any preparation short of the above mentioned could potentially create some issues.

I note your advice above and was wondring whether I should remove the filler and start over by applying Epiglass and letting it sit for a week so as to avoid the issue with ensuring correct timing to apply the filler over tacky Epiglass. Proceeding along with this route would ultimately be your best scenario overall, as there are a few potentials areas which could possibly create an issue down the road.
 
Hope this helps!
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ripard View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ripard Quote  Post ReplyReply Direct Link To This Post Posted: 06 Mar 2012 at 3:31am
Hi Jay, thanks so much for your help
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Jay@Interlux View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jay@Interlux Quote  Post ReplyReply Direct Link To This Post Posted: 07 Mar 2012 at 2:03pm
You are certainly welcome and not a problem at all!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote ripard Quote  Post ReplyReply Direct Link To This Post Posted: 03 Apr 2012 at 10:51am
Hi again Jay ... I have another question relating to curing time as my job is very nearly done ... finally!!

I have some patches of Gelshield Plus to apply where the yacht has been sitting on the cradle. I will apply the required 3 coats on the Friday, followed by 2 coats of Gelshield 200 and Micron 77 on the Saturday / Sunday. Is there a specified curing time required before immersion? I was planning to launch the boat first thing on the Tuesday. Is that sufficient time?

Many thanks again

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jay@Interlux Quote  Post ReplyReply Direct Link To This Post Posted: 03 Apr 2012 at 3:45pm
Sounds great and glad to hear that all is going well. The minimum immersion would be anywhere between 12/24 hours and there is no maximum immersion time. Therefore applying the last coat on Sunday and launching the boat on Tuesday would be just fine.
 
Hope this helps some more!
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