Repairing SMC and Fibreglass 

Thank you for the kind words. I hope you have success with your own projects.

Thank you for the comments.

Thank you for the kind words.

Thank you for the kind words.

Thank you for the comment, and great question! The resin used in fibreglass repair is ‘waterproof’. However, the glass fibres themselves are not; they will wick/absorb moisture which ‘rots’ the fibreglass over time. The fibres become exposed when grinding, or if they are not completely covered in resin which is why priming is required.

That depends on the damage. Are you replacing a small section, repairing a crack that is through to the other side, or just single sided. Resin with some matt or cloth would be good for a strong repair. Otherwise fiberglass reinforced filler or regular lightweight polyester bodyfiller may suffice for smoothing the surface.

@@benh4086 Thank you for the replay. I have a crack similar to @ 17:51. I repaired today using superglue to keep it in place (masking tape didn't work well), then painted w/Fiberglass Resin, placing some pieces of Fiberglass mat. Since it is my 1st project w/Fiberglass resin I messed up a bit, some mat didn't attached, etc. I got a bulge on the side that goes to the ceiling ~1/4 in tall and ~ 2" in diameter. Can I live it like that (it gives extra strength I assume) or better grind it off to the smooth surface w/let say an oscillating tool and sand paper #80? Will it be visible if I leave that bulge? I would appreciate any opinion on this question. I painted the whole headliner board w/Fiberglass Resine: on the ceiling side it came very well, like plastic, you can hear sound if you knock on it. The other side is still drying. I'll cover it tomorrow 2nd time. Everything looks good, but that uneven surface on the ceiling side, not sure about it. Thank you again.

Hello. There are many 2-component epoxy and urethane products available to bond composite panels by manufacturers such as Fusor, 3M, SEM, and many others. I do not recall the exact product used in the video, but it may have been Fusor 147; though T21 would be a better choice.

I have a video describing body fillers ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-JPCewvuy7pE.html

The product in the video is referred to as short-strand fiberglass filler. 'Kitty hair' is long-strand fiberglass filler. The difference is the length of the fiberglass strands. In many situations, they could be used interchangeably. However, long-strand fiberglass filler will provide more strength, but short-strand is easier to work with and still provides excellent strength. I hope that answers your question, and thanks for watching my video.

@@benh4086 so I can use this for repair on SMC fiberglass?

@@timstanford3443 hi Tim. SMC and Fiberglass are two similar (but different) materials. The video discusses this at the 0:20 mark. The repair in the video is on an SMC panel using SMC resin. In short; yes, you can use this repair on SMC and fiberglass.

I understand i guess my question is can I use the regular fiberglass short hair filler on a similar repair? Thanks again for your help!

@@timstanford3443 Yes, you can.

Hi Gary, Make sure you identify the material that the hood is constructed of (quite likely it’s Fibreglass or SMC; however, it could be another composite). Then check your repair material to see if it’s compatible. if it is not compatible, then purchase the correct product. It is usually best to avoid mixing products during the repair process. If you have questions about specific products, I would suggest contacting the manufacturer (in this case, 3M).

What's easier is really dependent on the specific damage and the skill of the technician. Cloth and mat each have their advantages and disadvantages. Generally, mat is great for smaller repairs.

I used aluminum tape in the video; any form of aluminum can work well as the resin will not adhere. Thank you.

@@benh4086 thank you. Do you know if the fiberglass resin wil adhere on the polypropilene pp plastic?

Canadian