Question on Boat

[yanks_178]

I currently am working on a 1992 Crownline that has not been washed in at least 5 years they sad. Heavy oxidation and many scratches from the dock (found about 2 cases of beer cans so not surprised). I washed it using Megs Gold Class and then hit it with 105 on a Megs W400 wool pad on my Dewalt Rotary with fast results and it looked good. I then hit it with 205 using the rotary with Megs W800. I topped it off with Megs Boat Wax. It looked fantastic and then this morning I went to finish it and noticed the oxidation was back already. I thought maybe it was the shade or something when I originally buffed it so I went at it again with 205, no improvement and then with 105 followed by 205, no improvement again.

The customer is going to be ecstatic with it but I am not. Does anybody have any other ideas on this or do I just chalk it up as it is as good as it is going to get?

Photos

Before:


50/50


This morning:




After 105 and 205 for again:








Any help would be appreciated!! Thanks!

[Yamaha0219]

I have a 1995 Crownline, 21 ft, basically the same style of boat. Mine's black, I was going to try the exact process you used but now I'm thinking I might try to wetsand it. My oxidation isnt as bad as that was, but I'm looking for some good improvement. I'm going to be keeping my eyes open to see if anyone else chimes in on this.

[Greg Nichols]

Here is my experience. Since gel coats are porous the gel sucks up the polish oils and makes it look like there is improvement. With oxidation that bad I suggest wet sanding to remove all the dried gel coat layers. You can also use 3M super duty compound, but I think you need to sand with Unigrit. A boat that bad I would find a air sander. 105 is a great follow up to sanding or 3M, but is whimpy to start with.

Cheers,
Greg

[yanks_178]

Originally Posted by Greg Nichols

Here is my experience. Since gel coats are porous the gel sucks up the polish oils and makes it look like there is improvement. With oxidation that bad I suggest wet sanding to remove all the dried gel coat layers. You can also use 3M super duty compound, but I think you need to sand with Unigrit. A boat that bad I would find a air sander. 105 is a great follow up to sanding or 3M, but is whimpy to start with.

Cheers,
Greg

I was afraid the wetsanding would be the only option left!! What would you recommend starting at 2000?

[Jakerooni]

Have you tried the actual Marine line from Mequires? The oxidation remover is more suited for this very thing. Then you have to seal it it back up so it dosen't just oxidize again. I tend to use Aquaseal from vesco (mainly because I still have stock of it) but any good gelcoat sealant should work well. Can't just be wax.

[Greg Nichols]

Originally Posted by yanks_178

I was afraid the wetsanding would be the only option left!! What would you recommend starting at 2000?

I would have 1500 - 2500 on hand. You will be surprised at how many sheets you will go through.

cheers,
GREG

[EastsideAutoSpa]

I have used a compound from presta (super cut i think) that is the roughest compund ive ever seen feels like sand, they say not to use it on cars but on boats ive had good experience with it. It Cuts way beeter than 3m, or Meg. marine line.

[EastsideAutoSpa]

i dug up some old pics that stuff really cuts through the oxidation.