Paint question

Tam Lin

Tam Lin

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I have searched but haven't found an answer.
I painted Tam Lin with Toplac but have found that it has got scraped and damaged. The boat needs a re-paint and I am thinking about a two pack product. International says that you can't paint a two pack over a one pack but how about if you put on a couple of coats of Interprotect? Will this provide enough of a barrier?
Otherwise it is back to Toplac as I can't face stripping it all off!
 
From the data sheet for Interprotect

Some Important Points Do not use below 5°C. Do not apply over conventional (one-pack) coatings. Do not apply when there is a chance of
condensation forming on the substrate. Ambient temperature should be minimum 5°C/41°F and maximum 35°C/95°F.
Product temperature should be minimum 10°C and maximum 35°C. Substrate temperature should be minimum 5°C/41°F
and maximum 35°C/95°F.
Compatibility/Substrates Interprotect can be used on all suitably prepared substrates and epoxy primers. Suitable for stainless steel trim tabs and
stern drive gear. It should not be used over any one pack products. Not suitable for use on bronze or mixed alloy
propellers.
Click to expand...
 
Tam Lin said:
I know what the data sheet says which was why I asked if Interprotect provides a barrier.
Do you mean that as Interprotect is itself a one pack it can't be over coated with two pack?
Click to expand...

No. It is a two pack and it can be overcoated with a two pack but it cannot be applied to an existing "one pack" .

See the highlighted sentences in the above extracts from the data sheet
 
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Tam Lin said:
I have searched but haven't found an answer.
I painted Tam Lin with Toplac but have found that it has got scraped and damaged. The boat needs a re-paint and I am thinking about a two pack product. International says that you can't paint a two pack over a one pack but how about if you put on a couple of coats of Interprotect? Will this provide enough of a barrier?
Otherwise it is back to Toplac as I can't face stripping it all off!
Click to expand...
the solvents in 2 pack will react with 1 pot paints.
either completely strip all traces of one pot & use 2 pot or repaint with one pot paint
 
PuffTheMagicDragon said:
Why not re-paint with Toplac?
Click to expand...

From what I hear and have seen, Toplac is a rather soft paint, which is why the OP has found it scratches easily. I am about to face the same problem as Wight Dawn has reached the point where it needs the topsides painted. A few years ago, I would have had no problem, as I could source one-pack polyurethane paints, which were hard and resisted wear and scratching. I cannot find any of them now. International used to do a harder paint called Brightside and I used it on a tender. That has worn well, except below the waterline. After the tender was left afloat while we were away, the paint started cracking and peeling.

To answer the original question, there is no barrier paint that I am aware of hat can be applied over a one-pack paint and subsequently over-coated with two-pack paint of any description. But where has all the one-pack polyurethane gone? Has the Elfin Safety regime or the environmental low VOC requirement rendered it illegal?
 
Wight Dawn said:
From what I hear and have seen, Toplac is a rather soft paint, which is why the OP has found it scratches easily.
Click to expand...

I only mentioned Toplac because it is what he has already and I do not know the extent of the scratches. I do not know what the boat is made of either. However, if a total painting job is required and the boat is made of GRP I would remove all of the one-pack and start afresh with a good two-pack.

Re your boat. I imagine that Wight Dawn is made of wood. If she is I would suggest you have a look at Veneziani 'Unigloss' which is a one-pack alkyd-urethane finish. More details here: http://www.venezianiyacht.it/default.asp?ID=28&IDm=5&LNG=2&IDp=237

EDIT: Just seen that Wight Dawn is a Westerly. If you want to try two-pack have a look at 'Gelgloss' on the same site that is linked. It stands up very well to Mediterranean sunshine so should be no problem on the lake.
 
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PuffTheMagicDragon said:
Why not re-paint with Toplac?
Click to expand...

Because I wanted something harder. The paint has rubbed off where the boat pushes up against the mooring buoy and even the straps on the travel hoist rubbed it off in places. Then there is where the tender bounced against it (before I put a rubber rubbing strake on it) and where the sander slipped when I was sanding down the wooden rubbing strake on the Centaur.
I can't stand the thought of stripping off the old one pack paint so I guess a quick rub down and re-coat with Toplac is the answer unless anyone can recommend a harder one pack paint.
BTW the boat is GRP.
 
Tam Lin said:
Because I wanted something harder.
I can't stand the thought of stripping off the old one pack paint so I guess a quick rub down and re-coat with Toplac is the answer unless anyone can recommend a harder one pack paint.
BTW the boat is GRP.
Click to expand...

I too had a Centaur (CR1279) that had been painted. Soon after I bought her I stripped off all of the old paint and made good all the dinks and scratches. I then applied a two-pack acrylic system using a borrowed compressor. Yes, it does take some effort but it is not something that you do every couple of years. The paint was still good when I sold the boat some ten years later. Well worth it, IMHO.

Should you persist in wanting a single-pack, see my post #10 above.

BTW, before my 'adventure' my only experience of spraying was limited to 1-metre RC sailing boat. It is not rocket science. ;)

CYANOonPontoonB13AUG2007.jpg


P.S. The previous colour was a VERY dark blue!
 
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