Painting Question. First Coat Done.

[kcs1211]

Im painting my 21ft Glasply hull. Prep went well, followed all instructions for Interlux Brightsides. First coat went on yesterday. I laid it a little thick, but overall first coat looks fantastic, this paint really shines. I'll get better w/my roll and tip on the top coat but....

I went to sand today w/220-320 grit paper just like the instructions say. I started w/my orbital and the moment it touched it the color came off. I then tried 320 grit by hand and the paint stays but the color comes off pretty quick. Turns a very light blue, not the beautiful dark blue it started as. Is this supposed to happen? I plan on putting 3 coats of paint on it, but Im not sure if so much color is supposed to come off when I sand. It doesn't say to wet sand, but should I?

Any help is appreciated, this is my first paint job. Sorry for the long post.

 

[NSBCraig]

Re: Painting Question. First Coat Done.

No answers yet?

I'm about ready to paint mine so I as curious what you found out.

Why did you go thick?

 

[tdrudd87]

Re: Painting Question. First Coat Done.

It depends on what color it is turning.

If you aren't taking it down to the old color you should be fine, just dont work it to long. THe sanding scratches will lighten the color quite a bit. try wiping the area with the appropriate solvent and some of the color should come back until the solvent dries off.

If you can tell it is all coming off right away, back to whatever color was under it, that would be weird and I don't know.

Hope that helps,
Terry

 

[drewpster]

Re: Painting Question. First Coat Done.

AH, my favorite subject.

The paint will be very soft such a short period after laying down a thick coat. Sanding between coats is meant to scuff the area for greater adhesion and to remove any defects. No more. If the first coat is very smooth no aggressive sanding is needed. You need only scuff the surface to remove the shine. It should look dull. If it is smooth use 400-600 wet paper...very lightly. Just enough to remove the shine in an area and move on. Think smooth and dull.
Dark colors will appear light colored when sanded. Again, if you have a smooth surface you need only scuff the paint. If you are sanding lightly and you sand through the paint too easy, you may need more dry time. (let it harden) Brightside will take up to 10 days before it is fully cured.
Sand by hand only. You can use a square sanding pad (hard foam) if you are sanding a flat surface to keep defects even. High spots should only sanded flat (fair) low spots should be sanded just enough to remove the shine and taper the edges just a bit. Less is more when color sanding a paint layer. Brightside is very durable but it will take time for a thick coat to harden up.
The best method is wet sanding with water and wet paper. Keep the area you are working in flushed with water while sanding. Keep a dry towel close by to dry the surface off until you get a feel for it.
I know the feeling, you grind and grind doing the prep, it is difficult to be gentle. Color sanding is much less aggressive and should go very quick.
Think smooth and dull.
Don?t worry about the color. The next coat will bring it back. In fact you will find the next coat easier to apply. The color will look deeper and deeper with each coat. Do thin layers from now on. Let the paint harden up for a couple of days before sanding.

enjoy
drewp

 

[mddubya]

Re: Painting Question. First Coat Done.

You roll this paint on? How durable is it?

 

[EthanFire]

Re: Painting Question. First Coat Done.

I think he was referring to the "rolling and tipping" of the spray head for corners and caps..... but not positive. When painting the spray head needs to stay as close to 90 from the surface as possible.

 

[EthanFire]

Re: Painting Question. First Coat Done.

I stand corrected..... I researched a bit and have seen a few references to "roll and tip" technique but have found no information. I don't want to take this topic off in another direction so I'll wait and ask about it on it's own topic. All I've ever done is spraying......

 

[tallcanadian]

Re: Painting Question. First Coat Done.

I rolled and tipped my boat with Brightsides. I too went with a heavy first coat but soon after regretted it. However, as mentioned above wet sand lightly between coats. Don't put on thick coats. Thin coats. I went with 3 coats on mine. Use a foam roller and lightly apply the paint in small sections. Then tip with a brush, always go in the same direction. I rolled towards where the rolled paint stopped. Make sure there is paint on the brush before tipping. Tip lightly. Just to get any bubbles out. Hope this helps.