Talk Composites - The Forum for Advanced Composites

Coating resin still tacky after 2 weeks?

http://www.talkcomposites.com/Topic6003.aspx

By Leew - 5/7/2013 10:57:47 PM

I applied some coating resin to a part about 2 weeks ago.  and even now it is still slighlty tacky to the touch.  Weirdly the excess resin in the mixing pot seems to have cured fully and is not tacky.  I used a digital scale and am pritty sure I mixed it 2:1.  The part is made from glass cloth and EL1 laminating resin.
Any idea what could be the cause of the tackyness, and any way I could salvage the part?  It took me quite some time to make the part so I'd really hate to have to toss it.
By Nimateck - 6/8/2013 10:24:48 AM

Dear Leew,
when you apply a surface coat like this,the resin does not 
have enough volume in order to "generate" a high exotherm.
This is why your resin inside the pot has been polymerasized.
My suggestions are:
1) Use a heating lamp 
2) Apply a "mist" coat of PVA on top of your resin,in order to "seal"
the resin.(after you must sand it and clear coat your part)
3) Try to use vinyl ester .

Kindly
Nimateck