View Full Version : Fiberglass still soft after two days

03-09-2006, 01:03 AM
I belive in one are, the batch of fiberglass I made did not have enough hardener. Now it is kind of mushy in one place and hard everywhere else. I let it sit for two days while I was on vacation. I assume it would have dried by now if it were going to. Can I paint on some hardener with a paint brush or just mix a new batch and try again?

I used the paper mache method of dipping the fiberglass and it worked well. If you want I can post some pics.

03-09-2006, 01:04 AM
just lay another layer of glass over it, this time use more than enough hardener

03-09-2006, 01:06 AM
It won't trap air this way?

03-09-2006, 01:07 AM
i would scrape it out, then redo the area.

03-09-2006, 01:08 AM
i would scrape it out, then redo the area.

or you could do that...depending on how large the spots are...this would be the best way to go

03-09-2006, 01:09 AM
It's a small area, about 1 square inch.

03-09-2006, 01:10 AM
if its mushy then just scrap it out and fill it in.

03-09-2006, 01:12 AM
will do...thanks

03-09-2006, 01:14 AM
Try a heat gun for like 15 min.

03-09-2006, 01:16 AM
if it haddent cured by now. then i would just redo it

03-09-2006, 01:26 AM
will a blowdryer work?

I am trying to scoop it out, but it ain't working out very well. I am using some scissors.

03-09-2006, 08:39 AM
you didn't mix well the hardener with the fiberglass.

lay one more hand fiberglass mixed with hardener or spray hardener over it and let it dry.

03-09-2006, 09:05 AM
just mix up anopther batch but instead of mixing the hardener at a 1% resin to hardener ratio mix it at maybe 4-5% and add 1 to 2 layers of glass over top making sure to really saturate the mat, this time it should be done by painting the resin on instead of dipping it in the resin, this way you'll paint it into the soft spots and this will allow everything to cure together

03-09-2006, 09:12 AM
Why not just mix up a small "hot" batch of resin and brush it on the soft area. :)

03-09-2006, 11:11 AM
Why not just mix up a small "hot" batch of resin and brush it on the soft area. :)

Can you explain further? Heat the resin or add extra hardener?

03-09-2006, 01:25 PM
Just add more catalyst ( mekp) to the resin than you normally would. If the area is small like you say. It shouldn't take much. Then just brush it on over the soft area. I betcha it hardens ;) :)

03-09-2006, 04:41 PM
basically add resin with hardner to the soft places, and then add a whole new layer to everything to seal it all, it will dry all together as a solid. I remember my first time i ever fiberglassed to get a mold out of my trunk, i never added the hardener, lol so i had to another layer of fiberglass witht he hardner and it worked.