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Started By
Message
Most abrasive sanding option for fiberglass?
Posted on 9/22/26 at 9:08 am
Posted on 9/22/26 at 9:08 am
I'm grinding down some gelcoat and topside paint on my boat to update my livewell and bench area, and my 4.5" grinder with a 40 grit is just slower than I'd like. I'm trying to get down to bare fiberglass to re do it right on an area that's probably 10-15 sq ft or so. Is there a more abrasive option? I have a belt sander, I haven't tried that, but I assumed the grinder would be better?
I'm thinking some sort of metal or ceramic idk?
I'm thinking some sort of metal or ceramic idk?
This post was edited on 9/22/26 at 9:09 am
Posted on 9/22/26 at 9:17 am to baldona
Get a flapper wheel or Diamond Disc, the Diamond disc will probably eat a lot faster then you would probably want to..
Posted on 9/22/26 at 9:18 am to baldona
Try and find some Sprira Cut ceramic 4.5" x 16 grit. Those things are badass.
ETA: your grinder needs to do at least 2,500 rpms
ETA: your grinder needs to do at least 2,500 rpms
This post was edited on 9/22/26 at 9:32 am
Posted on 9/22/26 at 9:18 am to baldona
quote:
4.5" grinder with a 40 grit is just slower
Jeez, I've never messed with gelcoat before but 40grit on a grinder will usually eat anything.
Make sure you're using fresh discs is all I got. Maybe drop down to 24gt
Posted on 9/22/26 at 9:57 am to baldona
flapper wheel.
Only issue is if you have some sort of glue or sealant to eat though.
Only issue is if you have some sort of glue or sealant to eat though.
Posted on 9/22/26 at 9:57 am to Turnblad85
quote:
Jeez, I've never messed with gelcoat before but 40grit on a grinder will usually eat anything.
40 works fine, but its a decent sized area and I'd rather over grind and fill back in with resin than the amount of time its taken to sand it down. Sanding/ grinding just sucks...I have some other projects in mind so I'm just trying to minimize the demo time.
Posted on 9/22/26 at 9:58 am to jpainter6174
quote:this
Get a flapper wheel
fast and easy with good control (no gouging). All I use
Posted on 9/22/26 at 10:15 am to snapper26
quote:
flapper wheel.
On what? I've used these for certain things, most grinding something specific down smaller. I need to sand at least 10 square feet. A flapper on a drill?
Posted on 9/22/26 at 10:24 am to baldona
on a grinder
Posted on 9/22/26 at 10:36 am to baldona
I refinished a canoe and had to tak a lot of it to fiberglass getting rid of multiple layers of paint. I used the flapper disc with sandpapper on a drill and clean and strip discs on a drill. The ones that look like a really hard black/red sponge.
Posted on 9/22/26 at 10:54 am to baldona
Makes me itch reading your post 
Posted on 9/22/26 at 10:56 am to jpainter6174
[quote]Get a flapper wheel [/quote
I use 120 grit flapper wheels to sharpen the blades on my bush hog. Easier to control than a grinding wheel and still aggressive enough to be pretty quick.
I use 120 grit flapper wheels to sharpen the blades on my bush hog. Easier to control than a grinding wheel and still aggressive enough to be pretty quick.
Posted on 9/22/26 at 1:11 pm to baldona
quote:
4.5" grinder
That's 99% of your problem. Get a 7" and add a flapper wheel to cover more area faster
Posted on 9/22/26 at 8:15 pm to Shexter
quote:
That's 99% of your problem. Get a 7" and add a flapper wheel to cover more area faster
Ha could be. It’s inside of a livewell and some other areas of a bench, the 7” kinda scares me unless I really need it. lol. That thing is serious
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