Spider web crack on fiberglass

[Bobik96]

I just sprayed my first coat of paint onto my fiberglass helmet, when I noticed a small spiderweb like crack. After I sand this down, if I need to build it back up can I use automotive "Bondo" on fiberglass?

[Skinner3D]

I know a guy that sent his royal guard helmet to the car body shop to get it filled and sanded and painted. I suspect you can do the same trick.

[Darth Voorhees]

Yes you can..i use bondo with/and fiberglass all the time. They are actually the same polyester resin base

[Bobik96]

Yes you can..i use bondo with/and fiberglass all the time. They are actually the same polyester resin base

i just sanded this down and the cracks are actually in the fiberglass. I'm going to have to use a dremil to widen the cracks so they can be filled. Have you used bondo in this application before?

[cucblack]

Don't confuse with fiberglass pieces. Fiberglass is the material used on the inner side. Exterior is resin or Gelcoat. You can apply any class of mass, bondo and paints over there.

 

If you want erase this mark, only need apply a extra fine mass. "Fast Mass" translated from spanish.

 

Now if it need repair. Open the lines with a dremmel disc, apply bondo. Better if you remove the paint before apply the bondo.

[Bobik96]

I started sanding and found that there was mass on top that did not hide the cracks. I sanded through the mass all the way to the base resin and scratches are still visible. They are in the resin.

 

I plan to widen the cracks with a dremil.

 

My concern was, can bondo be applied in such a thin coat? Or do I need a glazing putty.

[cucblack]

I started sanding and found that there was mass on top that did not hide the cracks. I sanded through the mass all the way to the base resin and scratches are still visible. They are in the resin.

 

I plan to widen the cracks with a dremil.

 

My concern was, can bondo be applied in such a thin coat? Or do I need a glazing putty.

 

emailed for help you.

[Bobik96]

Not bad for my first go around with fiberglass. I sanded down to the gelcoat and noticed that three of the little cracks had disappeared. I used a Dremel to open up the remaining cracks. I filled with Bondo, sanded and topped with glazing putty sanded primer wet sand primer wet sand primer.

[Skinner3D]

not bad at all.

[cucblack]

Great job Jason

[Darth Voorhees]

great job!

[Bobik96]

Thank you for the advice everyone. Someone dropped something on my boat over memorial day weekend and left one of these marks. Now I know how to fix it.

[EnigmaEngine]

Can't even tell it was there. Nice!