Getting rust spots off the GRP..

[wipe_out]

It seems that after returning from the boat yard we have some rust spots appearing all over the place on the grp, the worse being on the swim platform..

Any advice for removing these spots considering it's in the non-slip section so can't really be "polished" out..
View attachment 33110

 

[alahol2]

Someone's been grinding next to you by the looks of it. Use oxalic acid or buy a pot of Y10.

 

[skip50]

Someone's been grinding next to you by the looks of it. Use oxalic acid or buy a pot of Y10.

Much cheaper than Y10-use BKF (Bar Keepers Friend) it is mainly oxalic acid. Found in most supermarkets. Or you can buy industrial quantities of oxalic acid on ebay-suitable precautions need to be taken with that one.

 

[affinite]

Had exactly the same thing on my previous boat after a spell in a yard.
Oxalic acid did the trick

 

[Antony Collis]

I use StarBright rust remover.
Just spray it on and leave it without scrubbing and soon you'll be looking hard to see where the rust was. It's amazing.

 

[VicS]

Someone's been grinding next to you by the looks of it.

And the little (hot) metal particles may well have embedded themselves into the surface. You'll remove the stains with an oxalic acid based cleaner easily enough but they will keep coming back until the particles have completely rusted away.

 

[wipe_out]

And the little (hot) metal particles may well have embedded themselves into the surface. You'll remove the stains with an oxalic acid based cleaner easily enough but they will keep coming back until the particles have completely rusted away.

Hmmm.. That's going t be a pain in the butt!!

Thanks to all for the feedback.. I will have to order up what I need and then give it a go..

 

[kieronriley]

harpic limescale removing toilet cleaner costs about one pound and will get rid of your rust,and clean teak and remove that horrible brown stain you get near to your waterline and after that if you have any left you can even use it to clean your toilet.Kieron

 

[Jamesuk]

Someone's been grinding next to you by the looks of it. Use oxalic acid or buy a pot of Y10.

Yep grinding it does look like. Yes the above will work well. If that fails get the sandpaper/ compound out

 

[Adamastor]

Easier on the hands might be to find the palookah who was grinding unprotected and get him to effect the repairs.
Just saying!

 

[tcm]

The oxalic cures the rust spot but often the rust reappears. Airborne metal dust of all sorts can be the culprit - boats near railways lines have lots of these problmes for example. On a small scale, you have a lump of rusty metal caught in the plastic surface. With a Stanley knife or similar, you can find and pick out the bit of metal causing the rust. Removing the rust mark will then be permanent.