How to fiberglass Plywood Tank?

  • We are currently upgrading MFK. thanks! -neo
OK, do I have this about right?

Prime coat the tank with resin.
Soak 10" wide roving in resin and roll into corners. Can the roving be folded before soaking?
Sand roving.
Soak matt in resin and roll onto tank, overlapping roving about 3".
Sand matt.
Except for the prime coat, repeat two more times.
What weight roving and matt should I use?
Can you reccomend a brand of resin?
What grit sandpaper?

Is it true that polyester resin is not waterproof, but epoxy resin is? If this is true, can epoxy resin have color added as a final gelcoat over polyester?

I was leaning toward Pond Seal until I considered the possibility of an urchin or some wierd little hitchhiker on live rock chewing through the membrane. Which makes me a little itchy about using epoxy paint to seal polyester resin.
 
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Did the 2nd part, I personally would do 3 layers with chop mat but I ran out and Im not trying corners with this thick mat. I forget what it is, maybe 10oz. But I would then overlap all the seams with the chop mat and call it a day. 2nd vid is uploading, I knocked it over while glassin haha:nilly:
 
what a great enging to a video!!!!!!!!!!!!!!!!!!!! lol, i laughed my *** off when it fell. But seriously man. Thanks a lot for taking time out of your weekend to do that. Very very helpful indeed. I see how it kind of gels up real thick, and how mesy that mat can be.

One thing i did notice is you didnt use a roller?? whats the reason behind that?


i have a waaaay better understanding of what im going to be working with.
 
Waaaaaay too hot of a batch...
That much hardner and you see you have very little work time...
I have laid up fish holds that were 6' x 6' x 4'...you couldn't have ever done anything with that hot of a batch except get laughed off the dock...

When using mat and joining 3 corners you "tear" and thin the matting so there is one thickness when done...

Doods technique with the dirty paint brush poking air into the resin is NOT what you want to do...not to mention the back side of that mat was bone dry to start...

Get the roller out,
soak the fiberglass, roving or mat,
lay it in there over a cured "resin only" coat,
and roll out the air...

The hardner I use is blood red and when mixed at the right ratio, there is barely any color to the resin...

the longer it takes to cure (I.E. 24 hrs.) the stronger the laminate will be...

No disrespect to ITHURTZ, and I give him an "A" for the effort, but he hasn't ever did any glassing professionally, and if you do your tank like that you'll be sorry...
 
whoa I didnt know this was supposed to be a pro job. I just took a crappy paint brush in the basement, and gave him a general idea. Althought I do dab into corners like the first vid, Iv never had air problems in the past.

And the gelling in the first pic was to show how fast it can actually set up, the 2nd batch I made larger and lasted twice as long with no gelling. Man getting knocked down just trying to show someone the basics OUCH!
 
ITHURTZ;1720444; said:
whoa I didnt know this was supposed to be a pro job. I just took a crappy paint brush in the basement, and gave him a general idea. Althought I do dab into corners like the first vid, Iv never had air problems in the past.

And the gelling in the first pic was to show how fast it can actually set up, the 2nd batch I made larger and lasted twice as long with no gelling. Man getting knocked down just trying to show someone the basics OUCH!
Click to expand...
Not at all, You get an "A" for your efforts just like I said earlier...I just believe in doing things correctly the first time around. You know what I mean, so he can see what he is really up against...again ITHURTZ, no disrespect intended brother...
 
geez guys take it easy, lol. I know it was a general idea video.
Im going to be soaking the mating, and rolling it out. I went and talked to my buddy whos a master mechanic/autobody he said thats the best way to do it. No brushing especially since we are working with a lot of flat surfaces
 
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