I can relate to your experience. I just did the exact same thing on our Cal 29
. One side turned out beautiful, the other side turned out horrible.
A few things I learned from this:
The brush that you use to tip with makes a huge difference. I made mistake number 1 when I purchased a "high quality" china
bristle brush at our local paint dealer. It would have been suitable for whitewashing a stone wall, but other than that it was about as coarse and stiff as a kitchen broom. Lesson: spend the money
for a very good quality brush. You will be money
ahead in the end.
The temperature of the different sides of the boat were different - that affected the finish greatly. Also, I rolled the paint thinner on the side that came out very nicely and not so thin on the side that I really messed up. Lesson learned: After all of the excellent prep work that you put into it, don't hurry to put the paint on! (Emphasized!)
If you can paint under cover where there will be no direct sunlight to heat the hull
differently on the different areas - do it. I did not have that option. Hindsight is great. If I had to do it all over again, I would build a temporary structure over the boat to paint under.
The main lesson learned after I painted, sanded (sanding Perfection is like sanding
rubber!) and repainted:
Don't roll and tip! Spend the money on a compressor
and spray gun and spray it! Again, you will be money ahead in time and frustration.
Now to qualify all of my statements:
This is the first boat that I have ever tried to paint. I have never tried to paint with Polyurethane
of any kind. I have never tried to roll and tip before. It has been more than 20 years since I tried to spray a car or anything else for that matter.
I believe that with enough experience in painting with this material, rolling and tipping can provide excellent results. I believe that spraying is much easier and will result in a better overall finish with less experience. As long as care is taken to prevent runs and sags.
Perhaps next summer I will try once again to make my 30' paint job into a 5' paint job. But for now, it will remain as-is.