Bit of a thread hijack, and may have posted some of this before, but relevant to the painting.
Previously posted my Hamboard Tribute Kombi table.
Cut from chipboard, and painted with spray cans, I was initially happy with it, but decided I could do better.
Colours not right (look OK in the photo, but the yellow is very orange in real life)
Truck screws could be better countersunk, etc.
To do the first one, I sprayed it all yellow, then masked and sprayed the orange.
Masking tape left marks on the yellow, line not sharp, the paint never really hardened properly.
This was done leading in to Melbourne winter, temperature probably 12 degrees at night.
Haven't done anything like this for maybe 25 years, but do have some knowledge and skills from boat bimbling in my youth.
Bought some 18mm marine ply, cut two new decks.
Bought a new jigsaw to cut them, but they still needed significant smoothing with (newly bought) power plane, and sander.
Sanded the first one (on the right) with decreasing grades of paper, countersunk the truck holes.
Daughter No. 1 expressed interest in doing a deck design for an art project, passed it over to her.
Edge grain could have done with more filling, but pretty good.
Mine sat untouched for quite a while
Lessons learnt - let paint go hard, buy better quality masking tape, surface preparation is everything - don't take shortcuts.
And the process is extremely rewarding, just seeing it get smoother.
Re visited my deck.
Sanded the ply, painted with yellow spray cans, sanded, paint still not hardening properly despite baking with fan heaters.
Left for days between coats.
Night temperatures dropping to 6 degrees.
Sanded, achieved smoothness to some degree.
As above, it was pretty good, smooth, but paint not properly hard.
I suppose it doesn't matter when you are spray painting trains if the paint doesn't go off.
Got frustrated, got inspired.
Side issue.
Bought a couple of paddleboards in need of renovation.
Sort of knew what to do, lack the painting skills or experience.
Read a Seabreeze post about board repairs, where someone said something like "If you don't have the skills, give it a go, then you will"
I thank that person.
Initially thought I would do prep work, sanding, filling, get a boat builder mate to spray them.
Confident in the prep work, not anything else.
Thought more, decided I could do the lot.
Took the paddle boards to my mate's factory, got some advice.
Plan for each board, but I need to re learn / learn things.
Decided the Hamboard deck could be a test bed.
As above, it was already yellow all over both sides, probably 10 coats per side, but it had refused to harden.
Had put too much work in to the deck to abandon it, sanded the soggy yellow off.
Since the paint hadn't set, this took a lot of time and sandpaper, paint clogging it quickly.
Got it back to bare wood eventually, filled edges, re sanded wood.
Took my first bit of advice - painted the deck with two pack epoxy marine undercoat.
Way overkill for this, but learning for the boards.
Rolled on 4 coats. Re questioning of the expert after the first coat, mixing an impossibly small quantity of paint, you can re coat after 20 minutes or so, pot life of the paint allows this while the rolled on paint sets.
Went the patient way, and did each side separately. This is taking significant time now.
Mixed epoxy resin with QCells to fill the edges - way overkill for this but learning for the boards.
This paint went off - somewhere along the way I bought an outdoor marquee and put it up in my factory to give me a heatable area - 6 degree nights not good for paint going off,
Sanded back the epoxy undercoat, very satisfying, impossibly smooth.
Very tempted to leave it at that - I had the smoothest deck in the southern hemisphere, possibly the world.
Too scared of "real" spray guns with compressors, I found these Wagner guns - still a compressor, but contained in the back part of the gun.
Advice was to use 2 pack polyurethane over the epoxy undercoat.
Decided I had enough of a challenge learning to spray paint, without the challenge of paint going off while I was working, I opted for single pack (oil based) marine paint.
Conveiniently it came in orange and yellow, unlike the 2 pack.
Yellow first.
Rather than spray the whole board yellow again, and with reference to learning masking for the paddleboards, I masked off just the yellow bit.
Rather than the generic yellow masking tape I had used before, I bought some bear brand I think blue stuff.
Half an hour of preparation, 2 minutes of spraying, an hour of clean up.
But I'm learning, and pleased (amazed) with the look / success of my spray painting.
Volume of turpentine sprayed through huge.
Gloves and breathing stuff go from token effort to required.
4 coats 24 hours apart, left it masked, serious worries about bleeding under the tape.
Orange peel on the finish noticeable, but wrapt with my first go finish.
Probably a week in, unmasked with fear.
Tape had held up perfectly.
Again as practise, re masked the same line for the orange.
Easier than I expected to line up, but end result unknown.
4 coats of orange (coverage way better than yellow) over another week.
Unmask the second time.
No overspray, blue tape still in position.
Final unmasking.
Line is good, no bleed.
Original plan was to wet sand from here to remove orange peel, then polish.
At the moment I'm too scared - finish is pretty good "off the gun"
Paint is hard, colours true.
And I've had the confidence to touch up the challenging orange cammo paint on that board in the background while I bimble.
Major paddle scrapes both sides are now filled and sprayed over.
New paint needs some wet and dry flattening, but really pleased with what I've done.
If in doubt, have a go.
If it's only for you, you can't **** it up.
If it turns out wrong, you can allways go back and start again.
I am stunned at the satisfaction, and relaxation, I have got out of trying to do this stuff, and succeeding enough to keep myself happy.
So in answer to the original question, Blue masking tape.
I