js.b1 wrote:
Found time to dowel joint (Joint Genie Pro) & biscuit joint (Screwfix
cheapy) some cupboards in PAR Oak with white polypropylene back
panels.

For the cupboards I notice the oak is cupped slightly - enough that it
will need clamping as the glue sets. For the end panels I will also
need some form of clamping. The widest cupboard needs an 800mm span.

Is a 36" sash clamp the right tool?
There is Ebay 190040939713 (alloy) & Ebay 190040939346 (T-bar) for £20
& £23/pair.

Sash cramps are the ones to use - and if you're trying to keep the boards
flat, use cramps both top and bottom surfaces.

Note though that this will not straight individual boards that are 'cupped'
before cramping begins - only the whole mass.

To straighten the boards, simply cramp the lot together and then use either
a planer (preferably with a thicknesser) or use a hand plane (rather long
winded and tiresome) to finish off to the correct thickness.

And, to get the ultimate finish, use the old-fashioned steel scraper.

Cash