Quick question

Jakescc

Member
Does all this fiberglass need to be sanded smooth before any application of an epoxy primer. Or can it be just roughed up. Have not worked with fiberglass to much.
 

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Rbm

Active Member
Epoxy could be spayed on it. Depending what you want finished product to look like, most would be sanded off when leveling..what are you trying to achive ?
 

texasking

Active Member
Epoxy is the best over the bare glass. Sand it good with 80# and spray multiple coats. Let it dry a couple days, fill any holes with filler, then sand with 180# until smooth. 2 more coats of epoxy and it should be ready to final sand, seal and paint.
 

Jakescc

Member
Epoxy could be spayed on it. Depending what you want finished product to look like, most would be sanded off when leveling..what are you trying to achive ?
Epoxy could be spayed on it. Depending what you want finished product to look like, most would be sanded off when leveling..what are you trying to achive ?
Customer wants the inside to be baby smooth like the outside. Im guessing the fiberglass has to be sanded smooth with 80 grit before epoxy?
 

Chris_Hamilton

Trying to be the best me, I can be
I you gotta have it smooth, you're gonna have to sand it. I would 80 it to get it smooth. Up to 180 grit scratches will be okay on fiberglass. If I was doing it I'd work it down with 80 on the DA (3M 5778 - hookit) cause it is a lot more flexible than the standard type DA pad. 80 grit by hand on the areas I couldn't get to with the DA, then lightly go over it with 180 on the DA and by hand. If you are doing this for someone else be aware it's going to take awhile to really get it smooth cause that is mat as oppossed to strands. Or get it close (still try to scratch it all) then one coat to two coats of epoxy and then several coats of poly primer, after proper cure time for the epoxy.
 

crashtech

Combo Man
Cloth is bound to show some mapping eventually, imo, but maybe epoxy and an all-over skim with polyester putty would be the way to go. That or polyester primer. I guess the reason I would not be too aggressive with the sanding is that it can start to affect the integrity of the cloth. maybe I am overthinking that a bit though.
 

Jakescc

Member
Cloth is bound to show some mapping eventually, imo, but maybe epoxy and an all-over skim with polyester putty would be the way to go. That or polyester primer. I guess the reason I would not be too aggressive with the sanding is that it can start to affect the integrity of the cloth. maybe I am overthinking that a bit though.
Thats my thing I over think it all. To sand it smooth
I would probably break through which I don't thibk would be good.
 

texasking

Active Member
Don't try to sand every imperfection out, just knock all the high spots down. It would take quite a while to sand through fiberglass, and if you did, that would be sanding wayyyyyyy too much :)
 
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