Thinning Anti Foul. Help and Suggestions.

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oldgit

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Have inherited a near full drum of Leighs Paints Envoy T500 A/F.
It will need thinning to apply by brush.
Have looked at the manufacturers web site and it suggests that its No 5 thinner is the correct thinner to do the job but no details as to its content.
Suspect can wander across the road to my very local motor factor and purchase 5Litres of non branded stuff for a fraction of their asking price and P&P.
But what is it exactly.
Acetone ? White spirit or what...Suggestions welcome.
 
It's not white spirit (Thinners No 1) or xylene (Thinners No 3). If the manufacturer recommends No 5, then why not use it? Your idea of a motor factor might work, Thinners No 5 is used for lots of commercial paint.
 
Cellulose thinners is what I use on Jotun SeaGuardian. and International Interclene antifoul.
Never had any problems using ordinary "gunwash" type cellulose thinners as the finish isn't really an issue.
Only thing to be careful of is don't use synthetic brushes (they will melt!) and brushes with painted handles (thinners will cause the paint to come off covering your hands in sticky paint) |Don't forget to wear PPE, in particular eyeshields (cellulose will really damage your eyes)
 
oldgit said:
Have inherited a near full drum of Leighs Paints Envoy T500 A/F.
It will need thinning to apply by brush.
Have looked at the manufacturers web site and it suggests that its No 5 thinner is the correct thinner to do the job but no details as to its content.
Suspect can wander across the road to my very local motor factor and purchase 5Litres of non branded stuff for a fraction of their asking price and P&P.
But what is it exactly.
Acetone ? White spirit or what...Suggestions welcome.
Click to expand...

The thinners appear to be a mixture of light aromatic solvent naphtha and 1-methoxy-2-propanol.

If thinning is necessary Id suggest using the correct product. ...... but I have never thinned antifouling.
 
The MSDS for the paint includes the solvents xylene, MEK and ethylbenzene.
Why would the thinners for it be of solvents that aren't already present?
For brushing they say Cleanser Thinner no 5. For spraying however, no 9, which contains xylene 50-75%, MEK 25-50%, ethylbenzene 10-25%

Is the solvent you use as a thinner going to be critical? If for brushing you use white spirit which I believe is essentially 100% solvent naphtha will the absence of the propanol matter? Won't it just be a bit slower?

Confession - I have thinned SeaQueen with white spirit in the past in cold weather without apparent ill effects. It gave more brushing time which was helpful.
 
Plevier said:
The MSDS for the paint includes the solvents xylene, MEK and ethylbenzene.
Why would the thinners for it be of solvents that aren't already present?
For brushing they say Cleanser Thinner no 5. For spraying however, no 9, which contains xylene 50-75%, MEK 25-50%, ethylbenzene 10-25%

Is the solvent you use as a thinner going to be critical? If for brushing you use white spirit which I believe is essentially 100% solvent naphtha will the absence of the propanol matter? Won't it just be a bit slower?

Confession - I have thinned SeaQueen with white spirit in the past in cold weather without apparent ill effects. It gave more brushing time which was helpful.
Click to expand...

The recommended thinner contains a lighter grade of solvent naphtha than white spirit. C6 to C9 as opposed to C9 to C12
 
Last edited:
VicS said:
The recommended thinner contains a lighter grade of solvent naphtha than white spirit. C6 to C9 as opposed to C9 to C12
Click to expand...

OK - but does that matter? What difference will it make?
It doesn't seem much of a difference to worry about when approved solvents range from an alcohol to mek.
 
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