Alkyd paint

[EASLOOP]

I am about to paint my wooden hull with a good quality alkyd exterior gloss paint (intended for front doors). The hull is now painted with Brightside polyurethane paint. Will this work if I sand and undercoat/prime the poly paint before applying the new top coat. I have searched PBO but cannot get at this specific answer.
Your views would be most helpful.

John

 

[mainmarine]

According to International Paints booklet, Toplac and Brightside use the same undercoat and primer. Toplac is a silicone alkyd copolymer and Brightside is polyurethane. So one would assume that it would be OK, I would try a small area first to see if the previous finish softens, or contact International and ask them.
Malc
Mainmarine

 

[Peterduck]

My understanding is that you can paint alkyd over polyurethane, but not the other way around. The polyurethane is much more rigid than alkyd.
Peter.

 

[Mirelle]

May I raise a related point - Alkyd and chlorinated rubber?

May I butt in?

I recall that one can put one over the other but not vice versa - indeed I recall the accomodation block of a British bulk carrier that was painted the wrong way round by a keen Mate and peeled off in sheets!

Blakes deck paint is chlorinated rubber. Everyone else's is alkyd.

Can someone enlighten me as to which way round is safe?

 

[burgundyben]

Re: May I raise a related point - Alkyd and chlorinated rubber?

I dont know which way round is safe for deck paint, I can however comment on blakes chlorinated rubber, my deck was new 3 years ago, had two coat epoxy and then 2 coats blakes deck paint, still today looks as good as when it was done, desperately needs some non slip granules mind, its a git to apply, hard to keep wet edge gogin and very 'draggy'.

 

[Ships_Cat]

Re: May I raise a related point - Alkyd and chlorinated rubber?

I see no one has "butted in" to give an answer to your question Mirelle /forums/images/graemlins/smile.gif. So, while I am not 100% sure on this I suspect it goes like this.

Chlorinated rubber paints are also alkyds (with rubber mixed in) so I would be surprised if there was any compatability problem related to chemistry between them, so suspect it is only a physical problem. In that case one would expect that putting a non chorinated alkyd over a chlorinated one would be the problem. Unfortunately, from my understanding from some of your other posts to which others have suggested using alkyds over your existing deck paint, I think that may be what you want to do, in which case it would seem sensible to proceed with great caution.

John

 

[Mirelle]

Re: May I raise a related point - Alkyd and chlorinated rubber?

Thank you very much. Looks like I will be staying with Blakes' deck paint, then!