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Author Topic: Tw-Part epoxy curing question  (Read 1022 times)

April 23, 2011, 08:19:42 AM
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imonna 19 6

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Tw-Part epoxy curing question
« on: April 23, 2011, 08:19:42 AM »
Hello All,

Yesterday i sealed up a bunch of holes with six10 by west.  At the time of application the temp of the epoxy and the surfaces where around 60 degrees.  The app temp required for six 10 is 50 degrees with a cure time of 6 hours.

by 7 pm it was below 50 and apparently it went as cold as 32 last night because I woke to snow on the ground this morning. The epoxy has clouded (as it is supposed to do) and is almost thumbnail hard.  I know the temp will slow the cure.

The question is whether the slow cure will cause any weakness problems long term.

I am hoping your experience is that it will eventually get to its full cure state with no  long term consequence from  this cold snap.

Please chime in if you have any thoughts.  Some of these holes are ion the transom, so that's not a place i want a weak spot.


PS I am traveling for easter for the better part of the day, so if heat application is suggested i wouldn't be able to get to it until tonight

PSS it is supposed to be 65 tomorrow with a low of 50.

An example of the holes
Bill

1979 19\'6" with a 99 Johnson 100  

"Pull the Plug"

Northern CT

April 23, 2011, 08:59:00 AM
Reply #1

slvrlng

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Re: Tw-Part epoxy curing question
« Reply #1 on: April 23, 2011, 08:59:00 AM »
Use either a heat gun or even a blow dryer (or a heat lamp) to heat the repair areas up. You need to keep them warm for about an hour. This will help with the cure. Do not overheat these areas as epoxy will liquefy when enough heat is applied. I am still worried about your adhesion with gel over this stuff. It usually is not recommended.
Lewis
       1983 222 Osprey "Slipaway"
       1973 19-6 "Emily Lynn"
      

April 26, 2011, 11:09:53 PM
Reply #2

imonna 19 6

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Re: Two-Part epoxy UV protection
« Reply #2 on: April 26, 2011, 11:09:53 PM »
Well,   turned real warm on Saturday and sunday, so it would seem that the initial set was good (it did form up to almost thumbnail hard in 6 hours), was hard on Saturday, and rock hard sunday).  

So I learned of  the incompatibility between polyester resin gelcoat and epoxy AFTER i used the epoxy, so now have a dilemma and a problem. :roll:

Dilemma-  Do i drill out epoxy and refill with something that gel Coat will adhere to? :?:
Do i spend the money on a small amount of paint like interlux, that is compatable? :?:

Long term I want to do whatever is the proper fix.

Short term-Heres the problem.  I am literally out of money for this project.  As is always the case I am finding, these projects tend to expand quickly and mine is almost double what I budgeted.

My tank replacement turned into a tank replacement, new vent fitting, new fuel fitting, repair and replace a thru hull, bilge pump replacement and bilge pump rewire, ground bus replacement, two new deck hatches for access, transom and deck screw hole repair, trying to keep up with coast guard and ABYC standards, etc...

 have all ready made the three or four "final" purchases, (more 5200, more marine silicone, float switch for pump, more hose clamps, 4000uv, etc).

I cant really afford Bondo glass, or interlux, or more sandpaper, or primer.

If i can find a good temporary solution for the epoxy UV protection, i need to take it.  I can finish it the right way in the fall.

For reference, I am talking about 10-15 dime sized epoxy filled holes on the transom and four  1/4 inch epoxy filled holes on the deck.





Last thing i want to do is half-assed, but when the moneys gone, its gone.  Can I cover each spot with a uv resistent silicone, or 3m 4000UV, or is there something i can get at the hardware store that will do the trick.  

Sorry for the depressing tone of the post.  I am very pleased with the progress and look forward to getting more pics up.  I just need to solve this problem and hope the rest of the install goes smooth.

Here's what I am looking forward to (minus the goofy hat and coat)
Bill

1979 19\'6" with a 99 Johnson 100  

"Pull the Plug"

Northern CT

April 26, 2011, 11:23:14 PM
Reply #3

Circle Hooked

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Re: Tw-Part epoxy curing question
« Reply #3 on: April 26, 2011, 11:23:14 PM »
I would grind out some of the epoxy then get some marine tex and go over the holes,that should work and be a cheap fix that will last,iv'e filled many hole with that stuff and never had a problem,transom included.
Scott
1997 225 Explorer

April 26, 2011, 11:27:10 PM
Reply #4

slvrlng

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Re: Tw-Part epoxy curing question
« Reply #4 on: April 26, 2011, 11:27:10 PM »
Bill, just put the 4000UV over them for now. You can always drill them out when funds become available. Heck just sand them good like I told you with the 80 grit and put the gel over them. If a few pop off I don't think it will be a big deal!  Good Luck!!!!    :thumright:
Lewis
       1983 222 Osprey "Slipaway"
       1973 19-6 "Emily Lynn"
      

April 28, 2011, 10:01:51 PM
Reply #5

imonna 19 6

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Re: Tw-Part epoxy curing question
« Reply #5 on: April 28, 2011, 10:01:51 PM »
Will 400 UV block UV ? or is it just resistant itself to UV.  I have that on hand so if that will get me through the summer, then that's my first choice.   I also have 5200, 4200, and Life Seal Silicone on hand.

Will any of these work to block UV?
Bill

1979 19\'6" with a 99 Johnson 100  

"Pull the Plug"

Northern CT

April 28, 2011, 10:40:20 PM
Reply #6

Circle Hooked

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Re: Tw-Part epoxy curing question
« Reply #6 on: April 28, 2011, 10:40:20 PM »
Put some 5200 on there,you might have to chisel it off later but it will work.
Scott
1997 225 Explorer

April 29, 2011, 12:04:48 AM
Reply #7

seabob4

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Re: Tw-Part epoxy curing question
« Reply #7 on: April 29, 2011, 12:04:48 AM »
Actually, 5200 is not as "permanent" as one might think.  Soak the bond joint with some acetone for a while, and it will come off (de-bond) without pulling off the gel-coat...


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