Friday, 25 August 2017

Patriotic? Red, White and Blue

Got some finishing coats of paint on her.

The Red is Epivanes Foul-away 750ml (1.3 pints).  It took the whole tin (can) to paint this area, it's very thick and they recommend that you don't use thinners with it.

The Blue is Epivanes Monourethane (3129)  750ml. It took a quarter of one tin (can) to paint both sides - spreads nicely.


Before applying the paint I thoroughly cleaned the hull with Tack (Tak) rags, and then degreased the hull with a little thinners. Next the floor was washed to get rid of the dust.

Here's the paint specs:

Epifanes Mono-urethane (one-component)
A hard, one-component, air-drying, high gloss finish paint based on urethanealkyd resins. Provides superior covering and filling, long lasting weather durability and high gloss retention. For use on wood, steel, aluminium and fibreglass, for interior and exterior applications above the waterline in combination with the appropriate primers or directly on well degreased and sanded fibreglass. Also for use as a maintenance coat on intact well degreased and sanded one- and two-component paint systems. Do not apply directly on epoxy systems. Suitable for fresh and salt water. Thinner: Brush application - Epifanes Brushtinner for Paint & Varnish Spray application - Epifanes Spraythinner for Paint and Varnish Recoatable: After 24 hours at 18°C. (65°F.) Coverage: One litre is sufficient for 15 sq. metres ( 160 sq. feet) Package: 750 ml. Colours: 17 colours according to Epifanes colour card

Epifanes Foul-Away (selfpolishing  underwaterpaint) 
A copper, tin and boicide-free selfpolishing underwaterpaint. Due to the selfpolishing characteristics of this paint, the bottom will remain smooth, clean and will prevent unnecessary build-up of paint coats. This bottom paint can be applied over well degreased and roughly sanded existing hard antifouling, selfpolishing antifouling or vinyl based antifouling. Suited for use on wood, fibreglass steel, aluminium and for application on a not fully cured epoxy resin (surface still shows sticky) or on Epifanes Interimcoat. Application of three coats (225 microns dry filmthickness) is advised for long-term effectiveness. Allow 18 hours to cure before launching. Thinner: Preferably unthinned. Do not thin. If necessary thin with Epifanes Thinner D-100. Recoatable: After 6 hours at 18°C (65°F.) Coverage: 750ml. is sufficient for 8m2 Package: 750ml. Colours: white, black, blue, red, redbrown and green

Wednesday, 23 August 2017

Under waterline Priming


I've now put a coat of epoxy primer on the below the waterline area. I found that a mixed can of paint  + reactor  = 750 ml. which was barely enough to cover the underwater area.

The White Area is the Under Water Primer


Here is what it says in the Epifanes manual:

Epifanes Epoxy Primer (two-component) An anti-corrosive primer based on an epoxy resin and zinc phosphate as the anti-rust agent. High build, high filling capacity and easy sanding. For use as a filling primer in a two-component poly-urethane paint 51 

PRODUCT DESCRIPTIONS system on (ply-)wood and fibreglass and as an anti-rust primer in a two-component poly-urethane paint system on steel and aluminium.
For interior and exterior use above and below the waterline.

20 minutes before use, pour component B (reactor) in component A (base) and stir well. The mixing ratio is 100 parts comp. A to 14 parts comp. B by weight (100 part comp. A to 25 part comp B. by volume). The correct mixing ratio quantity is already in the cans.

 Potlife after mixing is 8 hours max. Thinner: All applications - Epifanes Thinner D-601 

Recoatable: After 12 hours at 18°C. (65°F.). Within 5 days without sanding Coverage: one liter is sufficient for 12 sq meters Package: 750 ml. - 2000 ml. - 4000 ml. Colour: white

Wednesday, 16 August 2017

Cutting in the Waterline.

My build-plans make no reference to the waterline, the only mention is the draught (draft) which is 8 inches or 200 mm. Yet I need to know exactly where the waterline is, as the underwater section is red, and blue above. I can't guess where it lies because the odds are that I'd get it wrong and end up with the paint-finish looking 'skew-wiff'!!

On Youtube I watched them carry a boat out and put it in the water, then go around with a marker and mark in the waterline. No way I can do that.

I then watched how the professionals did it and larger vessels. They used very expensive laser equipment, which I can't afford...
                                                          .... or can I?
I got one from Screwfix it was made by Bosch and cost £50 ($65).

From the centre of the bottom of the transom I measured down 8 inches and marked a point. Next a spirit level was used to draw a horizontal line across the transom: the only flat surface on the boat, the rest is complex curves.

Horizontal Pencil Line on Transom

The laser leveller was now set up.


The machine self-levels and in normal conditions - setting it up 5 - 10 yards (metres) away - would project the horizontal line the whole length of the boat. As it is, I only have one yard each side which, as you can see above, gives me a short line.

The machine was moved along until the end of the laser touched the pencil mark on the transom. Marks were made with a 'felt-tip' marker at short intervals along the horizontal laser line. The machine was moved further along numerous times until I reached the stem.
The marks left with the felt-tip marker just visible 

I then repeated the process on the other side, starting at the transom. My check would come if I ended up at the stem exactly in line with the previous line. They met within a 'gnat's whisker'.

Starting aft, I place a continuous strip of masking-tape along all the felt-tip marks.


   
I'd got myself a waterline! It is not where I would have guessed it would end up

Friday, 11 August 2017

Primer

Today I put on one coat of Epifanes Multi Marine Primer which took exactly 750 ml (1.3 pints).



This is reputed to be a good filler as well as a grounding for further coats of paint. I shall give it a good sanding down and re-coat in a few days.



Thursday, 1 June 2017

Fixing Them Holes

A few posts ago you can see how the fibreglass blanket I epoxied over the hull had developed quite a few bubbles in it. The temptation is to ignore the bubbles and paint over them. The problem then is that those bubbles are brittle and will shatter if banged, and this will then lead to a major problem of repairing not only the hole in the fibreglass but the ruined paintwork.

Working in small areas, I have been bursting the bubbles and removing the chards, which leaves a hole through to the wooden planking:



I then filled the holes with a mix of epoxy resin and filler powder.


I will sand these filled holes down tomorrow.
You will have noticed how the lovely polished varnish effect has gone for I have sanded the hull all over.


This process of coating and then sanding will go on for weeks until we reach the final finish!

Sunday, 28 May 2017

THE SECRET WEAPON That Put The Icing (Frosting) On The Cake

It was on the American website that I follow religiously, http://www.offcenterharbor.com, that I discovered the secret-weapon!

When one uses epoxy as a glue or as a filler, one has to deliver it to the area in which it is to used as efficiently as possible. I've tried trying to get it in place with a palette knife, pieces of wood and with a scraper. Although these ways work, it is very inefficient and......sticky.... and I have a bad reputation with sticky things!

Enter the secret weapon: the humble icing (frosting) bag, often called a pastry bag.

Icing/Pastry Bag
For the uninformed, this is a conical bag into which bulk icing  is placed. The tip of the bag is then snipped off to the required size. The bag is then squeezed and the icing emerges, very much like toothpaste out of a tube, and piped around the cake.

The problem I found was that when I put the glue in the bag, half of it got wasted sticking to the length of the inside of the bag: I only needed the bottom quarter of the bag, as epoxy goes-off very quickly so you can only work in small quantities.

My own invention was to put the bag in a tin (can) thus:


I mixed my epoxy glue in a yogurt carton and then scooped it into the bag:


Next I piped the glue beneath the bilge runner, which was loosely held in place by screws:


Finally, I screwed the runner into place, not too tightly but just enough for the epoxy to squeeze out a little (the epoxy's adhesive quality  secures the joint and not the pressure from tight screws, unlike many glues).

I then ran my gloved finger along the edges forming the squeezed out glue into a fillet.



Saturday, 27 May 2017

Outer Stem Completed

Trying to laminate the five pieces of hardwood that go to make up the outer stem was complicated and took a long time. As I mentioned earlier, trying to steam-bend the pieces during the winter let to them splitting.

I finally finished the stem yesterday. Each piece had to be glued in situ, and then held in place by panel pins and, where the bend was tightest, screwed. When the glue had set I removed the pins & screws before repeating the process for the next piece.

Where the stem met the planking an irregular bead of white glue was painfully obvious to the eye. Similarly, the joints between the laminates could clearly be seen. 


The white line between the stem and the planks is an irregular bead of glue

Using a sharp chisel I got rid of most of the volume of glue. Next the sides of the stem were  planed and sandpapered. Finally, I covered the sides of the stem with epoxy resin mixed with filler powder to a peanut butter thickness. I covered the sides of the stem with this, neatly filleting it onto the planks.



I've fitted the runners along the bottom, with screws, although they still have to be glued in place.