Dark gel coat with white rub marks from black bumper. Seems like they are under the surface.

[darrylgood]

Looking for help here. I have rubbed against a black corner bumper wheel with a rigid/sharp edge. Quite weird that the black bumper has left white marks. The marks seem to be in the paint from the pressure of the ridge on the bumper. As I run my nail along them they are smooth as the gel paint. Am I just not using the right product to remove the marks or is the damage worse and in the gel coat? Thanks so much

 

[04fxdwgi25]

That should buff out with rubbing (if deep) or polishing compound.

 

[Grub54891]

Is the fender scratched up? Almost looks like it rubbed off the fender. But it should buff out.

 

[darrylgood]

No not from the fender. 100% from the roller bumper on the side of our dock.

What I am stuck on is that I have had many rub marks on this boat, it always leaves a thin rubbery layer on gel coat and we can get it off. This one is as smooth as the gel coat and seems to be in the gel coat. Is this possible that it can damage the gel coat and not leave a break or indent/scratch in the gel?

 

[darrylgood]

That should buff out with rubbing (if deep) or polishing compound.

Any recommendation on a product to use?

 

[04fxdwgi25]

Try a boat polishing compound first. Have had great luck with Meguires One Step compound:

https://www.amazon.com/MEGUIARS-M6701-Step-Compound-1-Gallon/dp/B00029CYRG?th=1

 

[crazy charlie]

Try wiping a small section of it with Wd40 on a magic eraser and see if any of it is removed.You can also try some paint thinner or acetone.Just do a small section until you see which works.A polishing compound on a rotary wheel should remove it as well. Shorepower lines get the same strange marks and paint thinner takes them off.Charlie

 

[St1ngr4y]

I use aceton for fender-marks and that does the job without needing to apply any pressure. Comes right off without damaging the gelcoat.

 

[crazy charlie]

I use aceton for fender-marks and that does the job without needing to apply any pressure. Comes right off without damaging the gelcoat.

Acetone has the ability to damage many things.Certain gelcoats, decals,painted surfaces and stripes etc. I would only use acetone on the actual fender or shore power cables. Only try it on a very small spot first.Charlie

 

[Grub54891]

Acetone has the ability to damage many things.Certain gelcoats, decals,painted surfaces and stripes etc. I would only use acetone on the actual fender or shore power cables. Only try it on a very small spot first.Charlie

Interesting. I’ve used it alot cleaning bedding compound and rub marks like this post has and never had any issues. ?

 

[St1ngr4y]

It is a good advise to first try it on a small spot out of sight, and do no use it over stickers.

 

[Scott Danforth]

that is surface scratches in the gel coat, not rub marks or transfer marks. you aint wiping that off

if you look at it closely, it will have the suface texture of dry skin (where the polished layer was removed)

I would start with 600 grit wet-dry sand paper, then 800, then aquabuff 1000, then aquabuff 2000 and finish with 3M finess-it