Thread subject: Whaler Central - Boston Whaler Boat Information and Photos :: Wet Sanding Hull Questions

Posted by westcoastwhaler on 04/16/09 - 12:37 PM
#1

My Outrage 22 came with an old name removed from both sides of the hull, but the surrounding area of the name is dull, while where the letters were is glossy.

I tried heavy duty compound, finesse it and then polish all with my Porter Cable and I can still see the dull areas. My thinking is that the previous owner removed it by wet sanding, but did not buff it out or used a solvent like acetone.

I am going down the aggressiveness list and will be wet sanding starting at 600 and working my way up to 1200-1500, then repeating the compound, finesse, polish process.

My questions are:

Does it matter if you sand in a uniform direction (i.e. fore/aft) or does it matter?
Are the second and third sandings in the same direction or does it matter?
If I wet sand around the Whaler logo without removing it, will the transition look "funny" in this area? I have CF numbers and stripe removed, but I really do not want to remove the Whaler Logo.

Posted by Blue_Northern on 04/16/09 - 12:58 PM
#2

I wet sanded my Montauk and it did not make any difference which direction I went. I just made sure to get all the previous size paper scratches out before going to the next step -- I also increased the size of my sanding area an inch or so with every change of finer grit paper. I think this helps flair out the sanding so you remove every deeper scratch you just laid down. As far as the logo, I buffed right over mine with 3M Extra Cut followed by Finesse It and Wax. I never noticed a difference in the shine around that area.

Posted by Yiger on 04/16/09 - 1:05 PM
#3

Don't get discouraged if you can't get the old name's 'shadow' to completely disappear- it will fade over time. I tried just about everything on my sailboat after changing it's name but had little luck totally erasing the gloss that you mentioned. After one summer though it was almost invisible.

Posted by jquigley on 04/16/09 - 1:16 PM
#4

I found that I got a much better result with the compound by using a very high rpm with the buffer. I had to be very careful not to get the surface too hot, but I spun the buffer around 1200-1500 RPM and it made a very noticeable difference in the shine compared to the spots I did at a lower speed. You may try that on the dull spots first. Once you sand, you gotta go through all them steps again.

Posted by westcoastwhaler on 04/16/09 - 6:23 PM
#5

Guys, thanks for the responses. I will give the rubbing compound a try at a higher rpm prior to wet sanding.

Posted by kamie on 04/16/09 - 6:55 PM
#6

Always read the instructions, most products will provide instructions for both hand and machine use. Usually to include RPM settings.

Posted by jquigley on 04/16/09 - 7:00 PM
#7

kamie wrote:
Always read the instructions, most products will provide instructions for both hand and machine use. Usually to include RPM settings.


True, they do, but they don't always have the best rules for your particular application. If nobody experimented with anything we would be in a boring place, most likely without the convenience of these machines on which we are now talking...

Edited by jquigley on 04/16/09 - 7:00 PM

Posted by kamie on 04/17/09 - 6:50 AM
#8

John,
If you use a product like rubbing compound and don't follow the instructions your just wasting money and getting lousy results. Buff Magic is a perfect example, you need to really heat it up, and completely run thru the product on the gelcoat to have it work effectively. Now that I know that (finally read the instructions) I use less, and I can apply that to the non-skid and get reasonable results as well.

Posted by Blackduck on 04/17/09 - 6:57 AM
#9

Wet sanding is the way to go, but be sure to use a sanding block to keep from getting low spots. You should be able to even out the high spots and make the old letter ghosts disappear.

Posted by Doug V on 04/17/09 - 8:09 AM
#10

When I bought my Outrage 22 the gelcoat was flat looking after many years in Florida and Southern California sun. I wet sanded it starting with 800, then progressively finer. If I remember correctly, I went through 2000. I finished everything off with the Finesse-It II and then Driven Sealer. I am not sure that I needed to go all the way to 2000, but did it anyway.

I used a block in areas that were very straight and flat, but mostly just used my fingers. I counted strokes and marked the work areas off with a piece of tape stuck to the rubrail. That way I could keep track of what was covered and what was not and how much material I was removing at a given grit of paper. I tried to cover every area with the same quantity of sanding strokes, and hit every area twice.

Some of you may recall, the boat was named "No Risk" when I bought it. The lettering was very large. When I removed the lettering, there was a pronounced shadow. I worked the area over around the lettering a little extra. When I finished the entire process, you could barely see the lettering shadow. In a few weeks, it had totally disappeared.

The wet sanding routine is a bit tedious, but once done, if you tune up the gelcoat about once a year, you should not have to do it again.

I store my boat most of the year in a covered carport. The port side of my boat is exposed to the sun. I missed last year's gelcoat tune up, so I had to do a little extra Finnesse-It II buffing on the port side before I could wax it. It's all shined up now for the upcoming season.

Doug

Posted by jquigley on 04/17/09 - 8:16 AM
#11

kamie wrote:
John,
If you use a product like rubbing compound and don't follow the instructions your just wasting money and getting lousy results. Buff Magic is a perfect example, you need to really heat it up, and completely run thru the product on the gelcoat to have it work effectively. Now that I know that (finally read the instructions) I use less, and I can apply that to the non-skid and get reasonable results as well.


You have seen my project, no? That is a wet sand at 400, 600 and 1000, followed by 3M Imperial Compound, followed by 3M Finesse it II, then 3 coats of Carnauba. Yes, I did spin the buffer faster than they recommended, (or so I thought, as I have recently learned different, read on) and the results were better than what I achieved when I spun it slower.

It turns out, I was following the directions even though I thought I was using it faster than recommended. I must have been thinking of a different product.

This is from 3M's website about Imperial Compound..."This liquid compound and finishing material is designed to remove a P600 or P800 dual action sand scratch from gelcoat, with a wool pad. Designed to be used with an air or electric buffer (1500-2500 rpm) equipped with a 3M™ Compounding Buff Pads."