JM 1 Custom Kit

[Simon Barden]

That's no hardship! All the best with the new direction.

[Freakystyley]

Ok about 4 coats of primer on. A few rough spots, specks of dust etc.
I'm guessing they can be sanded out? Fine grade? Also there seems to be some grain showing on a section. Will it go away after some colour coats?

[Simon Barden]

The grain could simply be the paint following the wood contours. If so, yes, they and other marks should all sand out. If you can still vaguely see the wood underneath, then I'd suggest another coat of primer.

If you have a bit of grit stuck to the surface, I'd wait at least a day before sanding back, as if the paint underneath the dirt is still wet, then the grit can drag a lot of paint with it, which can leave a deep pit. So make sure it's had time to dry all the way through before sanding.

Now is the time to get the surface flat, ready for the top coats. I'd wet sand and probably start with P400 and then move up through the grades to maybe P1200 - but be careful when wet sanding of the holes. If there's not a good covering of primer in the holes, then the water can get into the grain and the wood swell up - which then causes you to sand through the finish around the holes. Unless you can block the holes up with rubber bungs, plastic tubing etc, then maybe use minimal moisture in those areas. Your paper will clog up quickly, so keep rinsing it, but apply it damp, rather than wet in those areas.

If you do get any swelling in your wood, then let it dry before more sanding as the swelling should decrease as the wood dries out (you simply can't write about these things without any double innuendoes).

Use a flat block for sanding wherever you can and use circular movements - no sanding with the grain any more.

[Freakystyley]

Thanks for all that. Brilliant. I'm leaving it overnight.
Can't see any of the wood through the primer, just the bumps of the grain. I'll have a sand tomorrow per your advice and get some colour on there and post the results.

Thanks for helping a first timer

[phrozin]

what sort of primer are you using just standard or hi fill id recommend high fill i would not recommend wet sanding primer it will swell the grain more than likely you will sand through the primer, sand it with 240 grit aluminum oxide dry paper which is the white stuff, if you going for a paint finish sand across the grain which will give you a nice flat surface to spray don't sand with the grain it will make it uneven. all ways use a block just take your time you only want to use 240 up until the absolute last sand before the colour and use a 360 or 400 aluminum oxide paper, DON'T wet sand till you got colour on it. The rule for sanding if you think you done enough chances are you probably haven't

[Sonic Mountain]

You can stop by my thread to see what happens when water gets under the final coat when sanding. As phrozin said you shouldn't wet sand primer as its usually a lot more porous than top coats.

[Freakystyley]

I'm too scared to look!! 2nd coat of colour on. Sanded out all the dust and small pits on the primer coats with 800 and 1200., no water! There are still a few nicks I can see but over all happy. I got one run in the colour
so wait until tomorrow and light sand and another coat.

[wazkelly]

Nice colour.

[Freakystyley]

I've noticed 2 runs now and some more specks. Should I run over the whole body now with 1200 or just concentrate on those spots. I have also noticed some lines heavier than others. I haven't overlapped on certain passes when spraying. Learning lots with this kit!!

[wazkelly]

1200 or maybe 1500 might be ok to knock down some of the high or lumpy bits. If using 1200 go easy as it can strip off more than you might think, particularly on soft greenish paint.