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scharette
05-15-2011, 01:58 PM
Hi,

this is the back of my swim platform. i had some delamination under the bracket. i've used a grinder to remove the material that was delaminated. i've tried to put some new resin & fiberglass matte. it seems that my job did not bond with the rest of the platform. it took only a screwdriver to remove the new material.. what i'm doing wrong ?

http://farm4.static.flickr.com/3053/5723043184_24ed668cab_b.jpg (http://www.flickr.com/photos/36840147@N06/5723043184/)
P5153232 (http://www.flickr.com/photos/36840147@N06/5723043184/) by scharette2009 (http://www.flickr.com/people/36840147@N06/), on Flickr

http://farm3.static.flickr.com/2069/5723042582_695ea06655_b.jpg (http://www.flickr.com/photos/36840147@N06/5723042582/)
P5153231 (http://www.flickr.com/photos/36840147@N06/5723042582/) by scharette2009 (http://www.flickr.com/people/36840147@N06/), on Flickr

tph
05-16-2011, 04:20 AM
I've heard that the West System epoxies have better adhesion characteristics. Also, I think thorough surface preparation is key.

ctjahn
05-16-2011, 08:51 AM
Hi,

this is the back of my swim platform. i had some delamination under the bracket. i've used a grinder to remove the material that was delaminated. i've tried to put some new resin & fiberglass matte. it seems that my job did not bond with the rest of the platform. it took only a screwdriver to remove the new material.. what i'm doing wrong ?

http://farm4.static.flickr.com/3053/5723043184_24ed668cab_b.jpg (http://www.flickr.com/photos/36840147@N06/5723043184/)
P5153232 (http://www.flickr.com/photos/36840147@N06/5723043184/) by scharette2009 (http://www.flickr.com/people/36840147@N06/), on Flickr

http://farm3.static.flickr.com/2069/5723042582_695ea06655_b.jpg (http://www.flickr.com/photos/36840147@N06/5723042582/)
P5153231 (http://www.flickr.com/photos/36840147@N06/5723042582/) by scharette2009 (http://www.flickr.com/people/36840147@N06/), on Flickr

Surface prep is key as the prior posted stated.... I have been doing glass work for over 15 years.

Looking at the images I can offer a couple suggestions. 1. Grind the mating surface down to the point where there is no paint showing anywhere you want it to bond. 2. Looking at the resin, I would use less than what you have been using. 3. Make sure your mixture is spot on. I often add extra hardener but you have to work quickly (and I have a lot of experience.) 4. Use a bruse to get the air out of the glass where it is adhering to. 5. Bondo brand products are fine (I use them too from any car parts store HOWEVER, a lot of people dont know there is a shelf life to the stuff. WEST products are easier to use. If there is dust on the containers go elsewhere. (Old material makes this sort of work a real frustration).

Feel free to contact me with any other questions. Look for my posting where I did my fender and you can see what is possible even in less than ideal situations. Best wishes on your project!

Cj

scharette
05-16-2011, 07:57 PM
Surface prep is key as the prior posted stated.... I have been doing glass work for over 15 years.

Looking at the images I can offer a couple suggestions. 1. Grind the mating surface down to the point where there is no paint showing anywhere you want it to bond. 2. Looking at the resin, I would use less than what you have been using. 3. Make sure your mixture is spot on. I often add extra hardener but you have to work quickly (and I have a lot of experience.) 4. Use a bruse to get the air out of the glass where it is adhering to. 5. Bondo brand products are fine (I use them too from any car parts store HOWEVER, a lot of people dont know there is a shelf life to the stuff. WEST products are easier to use. If there is dust on the containers go elsewhere. (Old material makes this sort of work a real frustration).

Feel free to contact me with any other questions. Look for my posting where I did my fender and you can see what is possible even in less than ideal situations. Best wishes on your project!

Cj

I have to agree that i might have used too much resin. Also, i tried to use new fiberglass over existing painted (gelcoat) surface. i will grind more and see what happen..
Thank for the suggestions.

Philscbx
06-02-2011, 05:00 PM
As ctjahn noted, and try to use the coarsest sanding discs of 24 - 36 grit.
I would use my Makita pro buffer with speed control vs 11,000 rpm only grinder.
You may have already re-sanded already.

Also anytime sanding, I get out the turbo blower axial fan with 12" dia hose 10' long to blow this stuff away from me, regardless of mask and protection.

I try to lay in the woven in small pieces that fill in the lowest cut divots first, then non-woven over it that covers the area.
I find that non-woven is much stronger, less able to bend vs woven.
Woven is easier at corners and laid at right angles to each layer.

Warmer weather helps as well. Or I'd add small heater to warm platform from under-side for about an hour first. Resin penetrates and flows out nicer on warm surface.
If it looks too wet, add dry material, and roll it in.

I have exactly the same project coming up on my platform where gusset cracks have formed.
Good Luck.