3M Fiberglass??

[Woodonglass]

Re: 3M Fiberglass??

These might help you understand how to do it... These were created using the assumptions you are using Poly resin and you will precoat all of the wood first. You do NOT have to use a Layer of 1708 as a final layer for the deck. You can just use 2 - 3 layers of 1.5oz CSM if you prefer. Tabbing up the sides of the hull proggessively 2,4 and 6 inches. Hope these VISUALS help. Make sure to grind the hull down to fresh glass so the new resin and glass will bond properly.

(Click the pics to enlarge)

 

[produceguy]

Re: 3M Fiberglass??

3M/8 sq. ft. Bondo fiberglass mat







Part Number: 488








Features & Benefits
Bondo? Fiberglass Mats are perfect for any size job. Great for repairs on any surface, including metal, fiberglass, and wood.

• Use with Bondo? Polyester Fiberglass Resin
• Has twice the strength as the Fiberglass Cloth and is easy to wet out
• Great for waterproof repairs on any surface, including metal, fiberglass, and wood
• Use for repairs on cars, boats, campers, trucks, snowmobiles, tanks, etc

<div class="videoKeywords"> You must have JavaScript enabled to see this Product Video.<br/> Video Name: <br/> This video covers the following areas: and other related topics. </div>
Part Number:488Weight:0.5 lbsCategory: UniversalChemical Resistant: YesColor / Finish: White/TextureCut To Fit: YesFloor Mat Material: Fiberglass MatNon-Slide Mat Backing: Fiberglass MatLength (In): 48Width (In): 24Package Contents: Fiberglass MatTheme: RepairWeather Resistant: Yes

 

[oops!]

Re: 3M Fiberglass??

looks like you are starting to get steered in the right direction......read ondarvrs post again....lots of good stuff there.

on thing i want to impress on everyone.....(YD allready said it) that thin woven stuff that looks like silk...(get it in a kit from wally world or other hardware store) is a finishing veil......its smooth...thats it. it has very little structural stregnth.
it is just used to make life a little easier during the finishing.
but the pro's rarely use it.
it has its place......i use it on decks that i am going to gellcoat.... but thats it.

1708 on the strings.
wrapping them over the top is useless.....it wont work....just go all the way up and use csm over the top. one wrap or two of the 1708 is your call.....but three is over kill

 

[produceguy]

Re: 3M Fiberglass??

Are we talking about the same stuff?

The matt in the pic is not ok to use on a boat?

 

[Yacht Dr.]

Re: 3M Fiberglass??

Are we talking about the same stuff?

The matt in the pic is not ok to use on a boat?

No..I was talking about the "finish cloth" or "veil cloth" that was mentioned ..not your mat..

But..One word of advice about them Tight packeted bags of mat.. the Wrinkles could be some problems depending on Where they land on your lams.

Use Bulk unfolded mat if at all possible when doing big jobs.

Yd.

 

[Woodonglass]

Re: 3M Fiberglass??

Correct me if I'm wrong but That is mat same as CSM and again it is NOT needed when using epoxy and in some cases NOT recommended by the mfg due to the fact that epoxy does NOT break down the binders in the mat and can cause the bond to be weaker. I belive Ondarvrs post was in agreement with this and if you check out Fibreglasts epoxies website you will find they do NOT recommend using csm with their's or any epoxy product. West Systems says you CAN use it but that it is NOT absolutely necessary. Cloth is the only thing required when using epoxy. That IS the accepted industry findings so if YD wants to contradict them then more power to him. I choose to follow the mfg recommendations.

 

[rickryder]

Re: 3M Fiberglass??

I do believe there are 2 packages available from the big box stores....3M offers the one the OP mentioned thats 9sq ft per bag and it's a lighter weight cloth and the one Produce Guy posted that is 8sq ft per pack and 6oz weight..... I have used the glass, csm and mat in a pinch and it's ok for tabbing in and such.....but for large area coverage get bulk roll glass like YD said.....the folds in the bag stuff makes it hard to lay down sometimes....

I think we have beat the dead horse on the bag-o-glass and should focus on the task at hand....helping the OP with his resto!!:facepalm:

 

[produceguy]

Re: 3M Fiberglass??

i do believe there are 2 packages available from the big box stores....3m offers the one the op mentioned thats 9sq ft per bag and it's a lighter weight cloth and the one produce guy posted that is 8sq ft per pack and 6oz weight..... I have used the glass, csm and mat in a pinch and it's ok for tabbing in and such.....but for large area coverage get bulk roll glass like yd said.....the folds in the bag stuff makes it hard to lay down sometimes....

I think we have beat the dead horse on the bag-o-glass and should focus on the task at hand....helping the op with his resto!!:facepalm:

agreed!!

 

[Bobby77]

Re: 3M Fiberglass??

I do like the US Composite glass materials. I do not believe I would go with an epoxy for glass to glass application but rather Vinylester personally. If I wanted to save some money then to Polyester.

In my case I have a customers 88 Cobalt has a severely rotted Aft Deck and the Threshhold to the bow next to the helm is Mush. I cannot see what is underneath but what I do see is a lot of bare waterlogged CDX Ply.

It has gotta go! My choices for this is Vinylester, 1.5oz CSM and Ill lay up a little bit of 1708. I havent decided on the deck material yet but I did want to lay down some 3/4 FRP but the Marine Ply is more cost effective and if I encapsulate it should not be a problem. Only issue I have is....I do not want this to happen again and if the customer started mounting to floor and not sealing the holes properly, the ply is gonna rot.

That is my only hangup.

I like epoxy, but with cloth and to wrap wood kayaks, canoes or dingys or even bonding. west system 403 is a wonderful filler, even with vinylester its fantastic for bonding and filling.

 

[aspenshayn]

Re: 3M Fiberglass??

This is brought over from a new thread I started, but will continue it here. sorry for the extra thread out there

How do I know if the fiberglass I just laid on stringer is good/will hold?
So I just glassed in my stringer with 1708 and epoxy resin. I worked it and worked it but still seemed to have air bubbles. I know when I removed my old stringer, the wood was completely rotten and just fell out after i cut top off the glass. The glass was still incredibly strong. So will my glass job be solid? is there a way to check (kick it or something, as you can tell I don't know much about glass)?
I'm hoping because I used epoxy resin, it will be stronger.
Do I need to lay another layer? I've read that if I use epoxy there is no need to lay another layer.

This was not as easy as it I thought it would be, but if it holds, it wasn't bad.

Thanks for the help through my other threads, I would have been completely lost without your help!

 

[aspenshayn]

Re: 3M Fiberglass??

one other thing. I will be laying my deck and pouring in foam. I don't think I have enough pour foam to fill it so I will be gluing in 2 liter bottles to take up some space and pour the foam to fill around it. Anyone ever do this?

I think this may be a "what ever floats your boat" issues.

 

[Salt Shaker 88]

Re: 3M Fiberglass??

Yes, Its a bad idea in most cases. If you have the money I would get more foam, if this a low cost project and you want to try it this is what I recommend. Use "Great Stuff" and fill the bottles, do not get this suff on your skin. If your deck is open you can use the blue board foam panels, a 4x8 sheet of 1 in foam from Lowes is cheap just make sure you pull the plastic off both sides. Cut the foam to fit your area and use spray foam to glue it in. Do this to your bottles to. Spray the foam on the area, let it expand a few minutes and while it is still sticky press the foam board or bottle into the spray foam. The foam will flatten out and turn in to camel snot. when it hardens it will never come apart. do not get this on your hands. Use additional spray foam to fill in any gaps, let this expand overnight.

A few things to note. blue foam board requires a primer if it will touch resin, Spray foam will shrink in sun light if not primered, spray foam will make lots of pressure and can blow out your deck if you use to much. One can of spray foam make around 1 cubic foot of foam. Spary foam is not effected by resin, gas, solvets, and will not come off your skin for days!

I used around a 100 cans of this stuff and lots of blue board on my 224 1988 Larson hull when I started the modifications. Before you fill every space under your deck with foam remember to figure out your rigging. I use 4 in sc 40 PVC below the deck to run my gear.

 

[sankanother1]

Re: 3M Fiberglass??

I am still around, but in limited capacity. Use polyester resin, as it is fine for these boats. 1708 will have to be purchased online, or if you get lucky, locally.

yes sir..Frisco knows all about the 1708..I bet he even says 1708 over 100 times in his videos...LOL (Yes my youtube name is runninonemty) And if you have not watched the video's..Put on some coffee and start from the beginning.You will learn everything you want to know.brilliant man

 

[aspenshayn]

Re: 3M Fiberglass??

Ready for carpet. Has anyone done an inboard where most of the middle section is missing like in my pics. My carpet will not go in the front as it is completely covered with a full bow seat.

Do I run two strips up the side of the boat hull and then one full complete strip for the deck? essentially the carpet would look like a fork with the middle missing and then would be full up to the front.

Or has anyone ever gone across the boat from side to side. Would this seam run havoc later on down the road. I assume yes, but want to here your input.

 

[aspenshayn]

Re: 3M Fiberglass??

another quick question. What is the best way to remove oxidation from a new engine block without having to repaint. I put in a new block the end of last season and it shows rust (submerged the entire engine 4 hours after complete rebuild) I cleaned it up and ran it for another 6 hours in the next couple of weeks. Over the winter it rusted up a bit (not too bad, see pics).

Let me know if you guys have any magic potions. Thanks.

 

[Salt Shaker 88]

Re: 3M Fiberglass??

Sorry for the late reply I have been off line for a while. what you need to use is Ospho (pronounced osfoe), it is a phosphoric acid derivitive. you can get it at Lowes, any marine store, and the internet. Google "Ospho" and read up on it many diferent bands, not sure on your current stage of repairs but i would recommend the method of thin it with water and spray on using a cheap plastic spray bottle. The acid will attack the Oxygen in the rust but not the base metal, you can normaly paint over this as a primer. Its a widley used product safe and cheap so you should be able to find a product that works for you.