Using the correct product (primer) this time, I painted the inside of the aft hull section.  The paint was quick to flash off once applied, which led to many lap marks as I struggled to work my way logically through the whole section, which process was admittedly more of a challenge than I’d expected (and I’d expected a challenge).  However, I got coverage everywhere, which was the goal, and since the boat would be sanded before any further work, the lap marks didn’t matter at this stage and frankly couldn’t be avoided despite all efforts.

I painted the face of the forward bulkhead, and also the transom, since these areas would be primed later anyway, and it made sense to do them now.

Meanwhile, I continued the daily buildup of varnish on the tiller, the byproduct of my other project.

I continued the varnish buildup on the tiller and extension with coat #2, an offshoot of my varnish work on another project.

In the afternoon, I saw a good opportunity to apply primer to the interiors of the boat halves.  For this job, I chose Epifanes 2-part polyurethane and appropriate primer for both inside the hull (white) and the outside of the hull (a custom mix to match the owner’s sailboat).  While I’d used, and liked, other Epifanes coatings over the years, I’d not ever used the 2-part specifically.

Earlier in the day, I’d pulled a package containing the paint for the job from a storage area where I’d been keeping it warm, and after confirming the label through the packaging (because I’d ordered both primer and topcoat), pulled out one of the two cans of primer inside the plastic wrapping and set it aside to use now.

I mixed the paint as required and set to work on the forward half, which was the “easier” of the two parts.  For primer, I figured I could cut in and tip with foam brushes, since at the moment I didn’t have any good brushes on hand other than the ones I used for one-part paints, but I didn’t want to start with a used brush.  Immediately, I was surprised at the nature of the primer and, since I chose to start with cutting in the difficult parts of the boat–the underside of the breasthook, and the corners at the aft end beneath the bulkhead gussets and such–I was quickly lamenting the lack of a good brush, but the product was covering fairly well (not as easily as I’d expected), and eventually I coated the whole section satisfactorily.  I was thinking the primer was surprisingly glossy and more finicky to work with than I expected, but overall the coating came out pretty well, and after all, it was just primer.  The small rectangular piece shown is the daggerboard slot cover.

I’d started with a fairly small batch, and while it had been more than enough for the forward half, I could see I’d need more for the second half.  Somewhere around here–I don’t know how exactly  it came into my conscious, it just did all of a sudden–I got a bad feeling, and felt the pangs of Captain Obvious, sometimes abbreviated as “DUH”; I rushed to check my paint can.

Did you see it coming?  It turned out that I’d mixed and used the topcoat for “primer” instead of the primer.  It seems I’d ordered one can of each (I ordered it a while back), and both cans, which looked similar enough to be roughly identical at a glance, had been wrapped in the same overwrap for shipping.  While I’d confirmed the primer label earlier in the day, the can I actually took out was the topcoat.  I was focused on the back of the can, where the mixing instructions were printed, and, being new to the paint, it never was obvious during mixing that I was using the gloss topcoat, especially when I knew I’d read the label through the packaging earlier in the day.  The cans happen to be identical except for the specific product labeling, which one might have thought was enough, but for the specific circumstances and a certain level of brain-deadness.

Doth I protest too much?  Maybe, because I’m embarrassed, but it was also easy to do even in hindsight, particularly when I thought I’d ordered two cans of primer which, naturally, would be packaged together.  Sigh.

Quick:  Which is which?

There’s no shame in mistakes, only in pretending they don’t ever happen.  I share this because it happened, and I could have easily chosen not to share it.

At this point, I cut my losses and left the aft half for another day.   This was a stupid, but not unrecoverable, error, and I planned to treat the first coat of gloss on the forward half just as I would if it was primer.  The good news in all this was that I learned some valuable things about the topcoat application, which would serve me well when I started to actually use the product intentionally later on.

If I’d had enough of the first mix left to complete the aft half, I might have just gone ahead with it despite the error, but since I didn’t have enough already mixed, I saw no reason to push forward.  That said, it’s notable that the designers of the boat write in the manual that “they don’t believe in primer” and the instructions don’t call for priming the boat before painting, even though I chose to stick with my own process and experiences and intended to use primer all along, and which I still think is the correct practice for any coating.

I might have mixed primer and done the aft half correctly, but the primer mix required a mix ratio based on weight, not volume (how annoying, by the way), and I had no means of weighing it at the moment.  It seemed better in all ways to stop and regroup, and turn to the aft half on another day.

No hours were harmed during the making of this mistake.

 

While my main focus remained now on another project at the shop, I still worked on the dinghy most days to continue various epoxy and related steps that were close to being, but not yet, done.

On Monday, I applied a second coat of epoxy to the rudder case, after sanding lightly the first coat, and with the same batch of epoxy applied another coat inside the holes bored for the rowlocks.

On Tuesday, I continued the process on the rudder case, with a third and final coat of epoxy on all sides.

I unmasked the rowlocks, now that the epoxy work was complete there.

At the aft seat, I bunged the screw holes from installation, installing the bungs in thickened epoxy to ensure that the screw holes were filled and watertight, since the installation screws had necessarily penetrated the aft buoyancy tanks.

With this work complete, on Wednesday I could get to some of the final preparations required for primer, mainly cleanup and masking.  I pared away the excess bungs from the aft seat cleats (sorry, forgot to photograph this), and, after cleaning the inside of the boat thoroughly, masked over the various new installations on the aft hull:  aft cleats, foot cleats, and rowlock risers, along with the connecting hardware.  On the forward hull, I masked the connecting hardware and the inside of the mast tube.

Since I had varnish underway for another project at the shop, it was a good opportunity to start the process on the tiller and tiller extension.

To give me better access to the inside of the hulls for painting, I dismantled the 4×8 plywood build table I’d constructed atop one of my normal shop benches, as this work table addition had increased the height by 4″ and made things awkward for reaching inside.  With the boat essentially complete, I no longer had need for the big table, and with it dismantled, I could set one half on the now-lower-and-narrower table, and the other half on a pair of sawhorses of similar height.  Now I was ready for primer whenever I had a time window.

 

It seemed a good day to finish up some of the last details required before moving on to primer and paint.  I started with the aft seat cleats, which I’d already epoxy-coated and varnished.  To install the cleats, I masked off a portion of the aft tanks, and taped the plywood seat in place so I could roughly determine the fore and aft position of the cleats.  The cleats were longer than the seat was wide, and were designed to extend beyond the seat by a bit on both sides.  By eye, I determined the placement and made a mark on one side, which I duplicated on the other.  This gave me the forward end of the cleats; then, I marked a line 7/8″ down from the top of the aft tanks, which represented the top edge of the cleats. From there, I dry-installed the cleats with two screws each, which screws would also hold the cleats later when gluing in place.

Note that in these photos, I had the boat propped vertically with the transom on the floor, which gave me the best access for this work.

With the cleats thus installed, I cut around them with a knife and, after removing the cleats, pulled the tape from the footprints.  Then, I installed the cleats permanently in thickened epoxy in the usual way, pulling the masking tape once I’d cleaned up the squeezeout.

Next, I unclamped the rudder case and spent some time sanding it clean and smooth.  I block sanded flush the ends where the 18mm plywood spacer met the edges, and rounded over and sanded smooth the edges of the plywood, with a small roundover hand-sanded on the inside edges of the plywood as well.  I built a simple plywood support stick that friction-fit inside the case, leaving all edges and sides accessible at once for epoxy-coating, the first coat of which I applied now.  I clamped the stick to the bench to let the epoxy cure all over.  There’d be a couple additional coats of epoxy over the next several days.

For the rowlocks, my next step was to drill through the gunwales for the 5/8″ bore required for the rowlocks themselves; the wooden risers had this 5/8″ hole already installed, which acted as a guide to drill through the gunwales.  I clamped a sacrificial board beneath each location so the drill wouldn’t break out and damage the underside of the gunwales.  I dry-fitted the rowlock bases to make sure the flanges fit flat against the riser; on one location I ran the drill bit through again to slightly open up the bottom part of the hole and allow the barrel of the rowlock base to fit properly and allow the flange to sit flush.

Those would get permanently installed later, but now I masked off around the holes and treated the new bores with epoxy, using a small brush to coat the insides of the holes.  I’d do at least one more coat later before calling this complete.