reinforcing with fiberglass only questoins

[douglee25]

I sent an email to US composits about using regular fiberglass resin on SMC. Hopefully they'll have a helpfull reply.

Honestly, don't go that route despite what others say (not knocking anyone). You'll have to do it twice. The repair may look good when you're finished, but in the end, the glass will end up delaminating. Epoxy has a much stronger bond.

Doug

Edit: Tim, see these links.

http://www.redrockstore.com/resin.htm

http://www.boats.com/content/default_detail.jsp?contentid=2907

 

[WaveDemon]

what is the best filler for the bond line? great stuff, 2 part foam, marine bondo, epoxy?

 

[douglee25]

what is the best filler for the bond line? great stuff, 2 part foam, marine bondo, epoxy?

2-part foam or epoxy mixed with filler works well for me. For the two part foam - turn boat on the side, mix up a slight amount of equal part foam, then pour. When it rises it will become hard at which point you can sand or saw to make level with the surface. On the other hand, mixing the filler with the epoxy is self explanatory. Mix into a peanut butter consistency and spread into the bond line. After either process is completed, fiberglass over the entire seam and you're good to go.

Doug

 

[RMBC Freeride]

hmmm, didnt know that......but whats "awhile?"

Today?.... Tomorrow?... maybe 2 years from now?...dunno??? Maybe the first time the hull flexes really good??? (such as a pancake, flat landing or major bail) Sorry Bro...

 

[Idok]

Today?.... Tomorrow?... maybe 2 years from now?...dunno??? Maybe the first time the hull flexes really good??? (such as a pancake, flat landing or major bail) Sorry Bro...

hmmmm, dude I believe ya..........guess I just havent seen any PERSIONAL evidence yet....




butti's B1 supertransom is also done with just FG res and biax......and that mofo takes a beatin'...

pretty sure my reinforced square is done with FG resin..and thats holding strong at least 8-10 years...



:dunno:



oh, demon....with both bill's and my boat we used marine bondo for the bond line...

 

[TB]

allow me to make a suggestion ive never seen anyone talk about here b-4.....

i work for a major auto parts supply chain..(not the biggest one but still decent sized) so needless to say over the past 9 years ive aquired quite a bit of catalogs and have done lots of parts searches... anyway back on topic theres a company out there named EVERCOAT and they make a product called vette panel adhesive...its a fiberglass based filler made especially for bonding together SMC BODY PANELS on corvettes and other newer vehicles with smc body parts if ya want something that'll hold a bond line on a smc hull this will do it without ever having to worry bout it again....if ya cant find it at a major part store or paint supplier pm me and we can see about getting ya some comes in quarts and gallons

 

[RMBC Freeride]

hmmmm, dude I believe ya..........guess I just havent seen any PERSIONAL evidence yet....

butti's B1 supertransom is also done with just FG res and biax......and that mofo takes a beatin'...

pretty sure my reinforced square is done with FG resin..and thats holding strong at least 8-10 years...
:dunno:

B1 hull and deck is all fiberglass... not SMC (except the interior engine mounting panels) so fiberglass resin works great on that transom, etc.!

As for your Square... FREAK OF NATURE!!!!! :biggrin: :biggrin: :biggrin:



Naaaah, thats cool, glad it is holding up!

 

[Idok]

once again,



:shrug:

 

[2nd nature]

hmmm, didnt know that......but whats "awhile?"

1-2-3-4 seasons???? anyone got any pix of a reinforement job that has delam'd???

when we did the reinforment ont he SJ, every bit of gel/paint that was inside the hull was ground out...guess I didnt realize the sj hull was SMC.....


I wonder if the longevity of the FG resin will outlast the life of the hull seeing as its a surf boat??

it didnt bond well to my 94 the footholds never saw water before i took them off to refoam and tray work.i used us composites also.i dont have a picture. but i did come off in stips like duct tape.not sure if they were put on or cleaned good before install. i removed them and did it right. i used 17 0z biax also. we havent even had to use a gallon yet.i think some of you guys are using waaaaaaaaay to much.and weve reinforced the back bond lines on two skis with this much.

 

[sflsurfrider]

definately use epoxy resin if you only want to do it once. the best way to do the bondline, imo, is epoxy resin with a filler. lay it on its side and pour. its best to do the reinforcement before the bondrail cures so the bondrail-fill and the reinforcemnt (biax, for sure.... i used 1208) will have a chemical bond.

 

[AIRICCC]

if you are talking about polyester resin when you say fiberglass resin, i can attest to the fact that it doesnt stick to smc.... It sticks 'okay' to the top deck, but it peels right off the bottom deck...
i bought a hull from yamasaki that had a polyester resin repair (after working with both epoxy and polyester you can tell which is which very easily) i peeled it up from the hull with a flathead screwdriver in about 5 minutes...

SMC stands for 'sheet mold compound' they fill the mold with this compound and then once it cures, they (yamaha) presses a release agent through it to get it away from the mold... some of this release agent stays with your SMC hull and will cause the polyester to not stick, as well as the fact that they dont bond well in the first place... proper preperation of the bottom half of the hull is crucial even when using an epoxy resin for this very reason...

reinforcment is VERY easy... you just have to get the balls to go and do it...

 

[AIRICCC]

i used glass bubbles for my bondline because they are flexible and will raise the volume of the resin, it also is a self leveling filler so lay it on its side /w microspheres and you'll be good to go

 

[Big Kahuna]

has anyone ever noticed that 24/7 only re-enforces the upper deck? I am thinking that the bottom is alot stronger than the top, so, no need to do that.......... (Surf sluts, I would say this is not for you!)....... save some weight and only do the top section.......... just a thougth.

 

[WaveDemon]

wahoo just bought a boat that only has carbon on the top half of the hull. I think it may bave been a 24-7 boat.

 

[Big Kahuna]

tried to go to the 24/7 site, they have updated it, and dont have the photo gallery anymore.............

 

[sflsurfrider]

why stop halfway? especially if youre grinding the ribs for pipe clearance. the weight gained is minimal compared to the strength added.

 

[SUPERJET-113]

SMC stands for 'sheet mold compound' they fill the mold with this compound and then once it cures, they (yamaha) presses a release agent through it to get it away from the mold... some of this release agent stays with your SMC hull and will cause the polyester to not stick, as well as the fact that they dont bond well in the first place... proper preperation of the bottom half of the hull is crucial even when using an epoxy resin for this very reason...

Close airicc.. Its a sheet and its heated up and sucked/pressed down to the mold. I worked at Kawasaki for 2 years and the hull press is 40 feet tall. Thats why on the real curvy areas the SMC is not as uniform and as thick as the rest of the hull.

You can also buy SMC compatible resin, but its just as much a expoxy. So you may as well use epoxy.:biggthumpup:

 

[sflsurfrider]

is the SMC vacuformed?

 

[2nd nature]

right

definately use epoxy resin if you only want to do it once. the best way to do the bondline, imo, is epoxy resin with a filler. lay it on its side and pour. its best to do the reinforcement before the bondrail cures so the bondrail-fill and the reinforcemnt (biax, for sure.... i used 1208) will have a chemical bond.

thats how i did the bond line.im not a pro at this at all. i used silica and epoxy we ordered a total of 6 and a 1/4 gallons. it never huurts to have to much and 6 yards of 17 oz. got my advise from crammitt .

 

[Idok]

butti's 24/7 ski (camo boat) has a reinforced bondline ONLY...all the work was supposedly done at wammers....he got the hull from Ed3SJ