Fiberglass box face not sealing

Printed From: the12volt.com
Forum Name: Fiberglass, Fabrication, and Interiors
Forum Discription: Fiberglass Kick Panels, Subwoofer Enclosures, Plexiglas, Fabrics, Materials, Finishes, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=76107
Printed Date: May 08, 2025 at 3:43 PM

Topic: Fiberglass box face not sealing

Posted By: kristkatalyst
Subject: Fiberglass box face not sealing
Date Posted: April 11, 2006 at 10:49 PM

This is my first fiberglassing project and I think I need a little advice.

I am building a box for my subwoofers out of 3/4" MDF. On the face of the box i have cut 3/4" mdf rings out to extend the subs out from the flat surface of the box (only 3/4 of an inch from the face, rings are glued onto the box). Material was layed and glued down with 3M Super 77 spray adhesive. Everything was pulled tight and i completely coated the fabric with resin. After 24 hours I applied the first coat of fibreglass. This fiberglass was purchased from Home Hardware and has the matte strands in it. :errr:

I thought this would be the easy way to go. When the fiberglass was dry I cut out each of the sub holes. When I cut out the holes the fiberglass started to life around the edges of each hole. The fiberglass is completely solid but it is lifting off. Is there any way I can just glue down the fiberglass around each hole. I am at the bodyfilling stage right now but do not want to bodyfill then have the entire surface crack because of one loose section.

If anyone can help they would be a life saver.

Thanks

Replies:

Posted By: Velocity Motors
Date Posted: April 12, 2006 at 8:47 AM

You will need to fiberglass the add-on that you did from the inside. The best way is to remove the opposite side of the box so you can see the back of the add-on peice. Thicken this part up and it will seal properly.

-------------
Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA

Posted By: kristkatalyst
Date Posted: April 12, 2006 at 10:49 AM

Makes sense. The problem now is that the box is completely screwed, glued and sealed throughout. No way to take the opposite side off to get in there. I have got pictures of the box and the problem I am faced with but it is a matter of posting them. Anyway, gonna have to keep trying. Thanks Velocity Motors.

Posted By: ricoshay
Date Posted: May 17, 2006 at 9:23 AM

i know i'm kinda late replying. Turn the box upside down(holes down) and place it so you can still reach inside (maybe on top of 2 chairs). Prepare resin and use brush to generously apply to inside walls of the surface that yo already put resin on. Let is run down the innner walls and pool up around the rings. Then apply resin over the rings too. tear smaller peices of fiberglass mat and apply 2 or 3 layers. This should fix your issue if i'm not too late.