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Bottom Paint slowing me down?

Old 10-07-2008, 11:41 AM
  #21  
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Default Re: Bottom Paint slowing me down?

rwidman - 10/7/2008 10:47 AM
Yes.

The dust is toxic. Don't inhale it, don't get it on your clothing and then get into your vehicle, don't bring them in the house without washing them first. Or wear disposable coveralls.

Don't get it into the environment. Collect it and dispose of it properly.
Dang. Containing the dust from myself isn't hard. Containing it from everything else could be more difficult. Maybe i'll look into some other way besides sanding.

I just don't want to effect the gelcoat or finish underneath the bottom paint. Or is that unavoidable?
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Old 10-07-2008, 11:47 AM
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Default Re: Bottom Paint slowing me down?

CThomps - 10/7/2008 2:41 PM

rwidman - 10/7/2008 10:47 AM
Yes.

The dust is toxic. Don't inhale it, don't get it on your clothing and then get into your vehicle, don't bring them in the house without washing them first. Or wear disposable coveralls.

Don't get it into the environment. Collect it and dispose of it properly.
Dang. Containing the dust from myself isn't hard. Containing it from everything else could be more difficult. Maybe i'll look into some other way besides sanding.

I just don't want to effect the gelcoat or finish underneath the bottom paint. Or is that unavoidable?
You're getting to the limits of my knowledge here so maybe someone else can chime in.

If the bottom was properly prepared for the original paint, it would have been sanded so there is already some "damage". You might do well to ask some of the local companies who do boat painting for advice or prices.
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Old 10-07-2008, 12:01 PM
  #23  
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Default Re: Bottom Paint slowing me down?

Guess I may have to make some phone calls.
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Old 10-07-2008, 09:48 PM
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Default Re: Bottom Paint slowing me down?

I am a speed demon. A perfectly smooth and waxed unpainted hull is worth about 2-3 mph over an unpainted hull with a little greeen thready growth but no barnacles on a 20 footer with about 175 hp.. I know. I tried. Fresh water though.
I cannot see how bottom paint could be much worse than growth.
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Old 10-07-2008, 10:10 PM
  #25  
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Default Re: Bottom Paint slowing me down?

Bottom paint will cost you a few mph
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Old 10-08-2008, 05:45 AM
  #26  
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Default Re: Bottom Paint slowing me down?

This is old (ish) bottom paint at this point. It's extremely rough and feels very thick.

To bad I don't have money right now to pay someone to professional remove the bottom paint. Ugh.
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Old 10-08-2008, 09:05 PM
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Default RE: Bottom Paint slowing me down?

A Festool RO150FEQ / CT22 combination is an excellent tool for that job. Just set the tool on random and slow speed. Let the paper do the work and cut through whatever layers exist.

Try50 then 36, then 24 grit until an appropriate cut level for the paint is found.

Sand 'till it just kisses the gellcoat, then smooth w/ 36 and 50.

Then polish smooth w/ a hand sanding block and long strokes up to 2K grit.

Here's an early pick of my painted to bare gellcoat rework.

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Old 10-09-2008, 03:47 AM
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Default RE: Bottom Paint slowing me down?

wingless - 10/8/2008 9:05 PM



A Festool RO150FEQ / CT22 combination is an excellent tool for that job. Just set the tool on random and slow speed. Let the paper do the work and cut through whatever layers exist.

Try 50 then 36, then 24 grit until an appropriate cut level for the paint is found.

Sand 'till it just kisses the gellcoat, then smooth w/ 36 and 50.

Then polish smooth w/ a hand sanding block and long strokes up to 2K grit.

Here's an early pick of my painted to bare gellcoat rework.

Even at low speeds I would not sujest using those grade's of sandpaper to someone who may not know what they are doing and never have done it before. You are just asking for disc marks in the gelcoat, UNLESSS you will be appling a barrier coat, then I say, have at it.
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Old 10-09-2008, 04:52 AM
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Default Re: Bottom Paint slowing me down?

Dropping from a top speed of 40 to 30 mph is pretty significant. I doubt removing the bottom paint will make that much of a difference. Perhaps it's a combination of the paint, tired motor and a waterlogged hull. Lose 3 mph for each problem and there you have it.

You can remove the paint with a chemical paint stripper and lots of elbow grease. I used Peel Away marine paint stripper to remove the bottom paint from my old 16' skiff. It was messy work, but it did a good job. You still have to sand, compound and wax after the Peel Away to bring the gelcoat back to its original smooth shine. I'll NEVER buy a used trailer boat with bottom paint again, because it simply wasn't worth the hassle. http://www.paintremoval.com/Qstore/p000035.htm
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Old 10-09-2008, 08:24 PM
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Default RE: Bottom Paint slowing me down?

dangerousdan5150 - 10/9/2008 6:47 AM
wingless - 10/8/2008 9:05 PM

A Festool RO150FEQ / CT22 combination is an excellent tool for that job. Just set the tool on random and slow speed. Let the paper do the work and cut through whatever layers exist.

Try50 then 36, then 24 grit until an appropriate cut level for the paint is found.

Sand 'till it just kisses the gellcoat, then smooth w/ 36 and 50.

Then polish smooth w/ a hand sanding block and long strokes up to 2K grit.

Here's an early pick of my painted to bare gellcoat rework.


Even at low speeds I would not sujest using those grade's of sandpaper to someone who may not know what they are doing and never have done it before. You are just asking for disc marks in the gelcoat, UNLESSS you will be appling a barrier coat, then I say, have at it.
My experience w/ that tool started w/ this project. I found it easy to get the feel.

Again, let the paper have enough time to work through the layers and a slow speed to avoid clogging the grit.

The hull had several layers of paint that were removed. The exterior was Micron Extra, then a thick barrier coat, then a primer.

The paint removal didn't preclude polishing and leaving bare gellcoat. There were several factory defects, both repaired and ignored uncovered when the paint was removed. One is shownon the image right side. Others were dry fiberglass voids.

The disc marks are easy to finish smooth w/ this tool and finer grit.
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Old 10-10-2008, 09:55 AM
  #31  
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Default Re: Bottom Paint slowing me down?

http://www.trailerboats.com/output.cfm?id=1082107

This link has a test of this boat with a yamaha 90 four stroke
40.8 with 2 people and half tank of gas- for whatever it means
With paint I would guess up to 2 MPH performance loss but that is internet reading not specific experience

Good luck
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